Dell™ Dimension™ 8400 Service Manual
Notes, Notices, and Cautions
NOTE: A NOTE indicates important information that helps you make better use of your computer.
NOTICE: A NOTICE indicates either potential damage to hardware or loss of data and tells you how to avoid the problem.
CAUTION: A CAUTION indicates a potential for property damage, personal injury, or death.
Abbreviations and Acronyms
For a complete list of abbreviations and acronyms, see the Dell Dimension Owner's Manual.
If you purchased a Dell™ n Series computer, any references in this document to Microsoft® Windows® operating systems are not applicable.
NOTE: Some features or services may not be available for your computer or in certain countries.
Information in this document is subject to change without notice.
© 2004 Dell Inc. All rights reserved.
Reproduction in any manner whatsoever without the written permission of Dell Inc. is strictly forbidden.
Trademarks used in this text: Dell, the DELL logo, and Dimension are trademarks of Dell Inc.; Intel and Pentium are registered trademarks of Intel Corporation; Microsoft and
Windows are registered trademarks of Microsoft Corporation.
Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or their products. Dell Inc. disclaims any
proprietary interest in trademarks and trade names other than its own.
Model DHM
November 2004
Rev. A00
Memory modules are detected, but
a memory failure has occurred.
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and then restart the computer. If the computer starts normally, reinstall an additional module.
Continue until you have identified a faulty module or reinstalled all modules without error.
If available, install properly working memory of the same type into your computer.
If the problem persists, contact Dell.
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A possible graphics card failure has
occurred.
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and then restart the computer.
If the problem still exists, install a graphics card that you know works and restart the
computer.
If the problem persists or the computer has integrated graphics, contact Dell.
A possible floppy or hard drive
failure has occurred.
Reseat all power and data cables and restart the computer.
A possible USB failure has
occurred.
Reinstall all USB devices, check cable connections, and then restart the computer.
No memory modules are detected.
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and then restart the computer. If the computer starts normally, reinstall an additional module.
Continue until you have identified a faulty module or reinstalled all modules without error.
If available, install properly working memory of the same type into your computer.
If the problem persists, contact Dell.
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Memory modules are detected, but
a memory configuration or
compatibility error exists.
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Ensure that no special memory module/memory connector placement requirements exist (see
Verify that the memory modules that you are installing are compatible with your computer (see
If the problem persists, contact Dell.
A possible expansion card failure
has occurred.
restarting the computer.
2. If the problem persists, reinstall the card that you removed, remove a different card, and then
restart the computer.
3. Repeat this process for each card. If the computer starts normally, troubleshoot the last card
removed from the computer for resource conflicts.
4. If the problem persists, contact Dell.
Another failure has occurred.
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drive, and DVD drive.
If there is an error message on your screen identifying a problem with a device (such as the
floppy drive or hard drive), check the device to make sure it is functioning properly.
The operating system is attempting to boot from a device (such as the floppy drive or hard
for the devices installed on your computer.
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If the problem persists, contact Dell.
The computer is in a normal
None.
operating condition after POST.
Beep Codes
Your computer might emit a series of beeps during start-up if the monitor cannot display errors or problems. This series of beeps, called a beep code, identifies
a problem. One possible beep code (code 1-3-1) consists of one beep, a burst of three beeps, and then one beep. This beep code tells you that the computer
encountered a memory problem.
Reseating the memory modules may fix the beep code errors in the following table. If the problem persists, see "Contacting Dell" in your Owner's Manual for
instructions on obtaining technical assistance.
Code
1-3-1 through 2-4-4 Memory not being properly identified or used
4-3-1 Memory failure above address 0FFFFh
Cause
If you hear one of the following beep codes, see "Contacting Dell" in your Owner's Manual for instructions on obtaining technical assistance.
Code Cause
1-1-2 Microprocessor register failure
1-1-3 NVRAM
1-1-4 ROM BIOS checksum failure
1-2-1 Programmable interval timer
1-2-2 DMA initialization failure
1-2-3 DMA page register read/write failure
3-1-1 Slave DMA register failure
3-1-2 Master DMA register failure
3-1-3 Master interrupt mask register failure
3-1-4 Slave interrupt mask register failure
3-2-2 Interrupt vector loading failure
3-2-4 Keyboard Controller Test failure
3-3-1 NVRAM power loss
3-3-2 NVRAM configuration
3-3-4 Video Memory Test failure
3-4-1 Screen initialization failure
3-4-2 Screen retrace failure
3-4-3 Search for video ROM failure
4-2-1 No time tick
4-2-2 Shutdown failure
4-2-3 Gate A20 failure
4-2-4 Unexpected interrupt in protected mode
4-3-3 Timer-chip counter 2 failure
4-3-4 Time-of-day clock stopped
4-4-1 Serial or parallel port test failure
4-4-4 Cache test failure
System Messages
NOTE: If the message you received is not listed in the table, see the documentation for either the operating system or the program that was running
when the message appeared.
Message
Possible Cause
Corrective Action
8042 Gate-A20
error
The keyboard controller failed If you receive this message after you
its test.
make changes in the system setup
program, enter the system setup
program and restore the original value
(s).
Address Line
Short!
An error in the address
decoding circuitry in the
memory has occurred.
C: Drive Error
The hard drive is not working Ensure that the drive is installed
or is not configured correctly.
correctly in the computer and defined
C: Drive Failure
Cache Memory
Bad, Do Not
Enable Cache
The cache memory is not
operating.
See "Contacting Dell" in your Owner's
Manual for instructions on obtaining
technical assistance.
CH-2 Timer Error An error is occurring on the
See "Contacting Dell" in your Owner's
Manual for instructions on obtaining
technical assistance.
timer on the system board.
CMOS Battery
State Low
The system configuration
information in the system
setup program is incorrect or
the battery charge may be
low.
the system configuration, and then
restart the computer.
CMOS Checksum
Failure
CMOS System
Options Not Set
CMOS Display
Type Mismatch
CMOS Memory Size
Mismatch
CMOS Time and
Date Not Set
Diskette Boot
Failure
Drive A or B is present but
has failed the BIOS POST.
Ensure that the drive is installed
correctly in the computer and defined
Check the interface cable at both ends.
DMA Error
the system board. to be replaced.
DMA 1 Error
DMA 2 Error
FDD Controller
Failure
with the floppy drive or hard
drive controller.
computer and defined correctly in the
system setup program. Check the
interface cable at both ends.
HDD Controller
Failure
INTR1 Error
INTR2 Error
An interrupt channel on the
system board failed to POST.
to be replaced.
Invalid Boot
Diskette
be located on drive A or drive confirm that drive A or drive C is properly
C.
identified.
Keyboard Error
The BIOS has detected a
stuck key.
Ensure that nothing is resting on the
keyboard; if a key appears to be stuck,
carefully pry it up. If the problem
persists, you may need to replace the
keyboard.
KB/Interface
Error
An error occurred with the
keyboard connector.
Ensure that nothing is resting on the
keyboard; if a key appears to be stuck,
carefully pry it up. If the problem
persists, you may need to replace the
keyboard.
No ROM Basic
be located on drive A or drive confirm that drive A or drive C is properly
C.
identified.
Before You Begin
Dell™ Dimension™ 8400 Service Manual
Getting Started
This section provides procedures for removing and installing the components in your computer. Unless otherwise noted, each procedure assumes that the
following conditions exist:
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You have performed the steps in "Turning Off Your Computer" and "Before Working Inside Your Computer."
You have read the safety information in your Dell™ Product Information Guide.
A component can be replaced by performing the removal procedure in reverse order.
Recommended Tools
The procedures in this document may require the following tools:
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Small flat-blade screwdriver
Phillips screwdriver
Flash BIOS update program floppy or CD
Turning Off Your Computer
NOTICE: To avoid losing data, save and close any open files and exit any open programs before you turn off your computer.
1. Shut down the operating system:
a. Save and close any open files, exit any open programs, click the Start button, and then click Turn Off Computer.
b. In the Turn off computer window, click Turn off.
The computer turns off after the operating system shutdown process finishes.
2. Ensure that the computer and any attached devices are turned off. If your computer and attached devices did not automatically turn off when you shut
down your operating system, press and hold the power button for 4 seconds.
Before Working Inside Your Computer
Use the following safety guidelines to help protect your computer from potential damage and to help ensure your own personal safety.
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.
CAUTION: Handle components and cards with care. Do not touch the components or contacts on a card. Hold a card by its edges or by its metal
mounting bracket. Hold a component such as a processor by its edges, not by its pins.
NOTICE: Only a certified service technician should perform repairs on your computer. Damage due to servicing that is not authorized by Dell is not
covered by your warranty.
NOTICE: When you disconnect a cable, pull on its connector or on its strain-relief loop, not on the cable itself. Some cables have a connector with
locking tabs; if you are disconnecting this type of cable, press in on the locking tabs before you disconnect the cable. As you pull connectors apart, keep
them evenly aligned to avoid bending any connector pins. Also, before you connect a cable, ensure that both connectors are correctly oriented and
aligned.
NOTICE: To avoid damaging the computer, perform the following steps before you begin working inside the computer.
NOTICE: To disconnect a network cable, first unplug the cable from your computer and then unplug it from the network device.
2. Disconnect any telephone or telecommunication lines from the computer.
3. Disconnect your computer and all attached devices from their electrical outlets, and then press the power button to ground the system board.
CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover.
NOTICE: Before touching anything inside your computer, ground yourself by touching an unpainted metal surface, such as the metal at the back of the
computer. While you work, periodically touch an unpainted metal surface to dissipate any static electricity that could harm internal components.
Opening the Computer Cover
Dell™ Dimension™ 8400 Service Manual
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.
CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover.
NOTICE: Ensure that sufficient space exists to support the open cover—at least 30 cm (1 ft) of desk top space.
2. Lay the computer on its side so that the arrow on the bottom of the computer points up.
3. Open the cover:
a. Facing the back of the computer, press the release button on the right side of the computer with one hand while pulling up on the top of the
cover with the other hand.
b. Press the release button on the left side of the computer with one hand while pulling up on the top of the cover with the other hand.
c. Hold the bottom of the computer with one hand, and then pull open the cover with the other hand.
Closing the Computer Cover
Dell™ Dimension™ 8400 Service Manual
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.
1. Ensure that all cables are connected, and fold cables out of the way.
Gently pull the power cables toward you so that they do not get caught underneath the drives.
2. Ensure that no tools or extra parts are left inside the computer.
3. Close the cover:
a. Pivot the cover down.
b. Press down on the right side of the cover until it closes.
c. Press down on the left side of the cover until it closes.
NOTICE: To connect a network cable, first plug the cable into the network device and then plug it into the computer.
4. Connect your computer and devices to electrical outlets, and turn them on.
Removing and Installing Parts
Dell™ Dimension™ 8400 Service Manual
Memory
You can increase your computer memory by installing memory modules on the system board.
Your computer supports DDR2 memory. For additional information on the type of memory supported by your computer, see "Memory".
DDR2 Memory Overview
DDR2 memory modules should be installed in pairs of matched memory size, speed, and technology. If the DDR2 memory modules are not installed in matched
pairs, the computer will continue to operate, but with a slight reduction in performance. See the label on the upper-right corner of the module to determine the
module's capacity.
NOTE: Always install DDR2 memory modules in the order indicated on the system board.
The recommended memory configurations are:
¡
A pair of matched memory modules installed in DIMM connectors 1 and 2
or
¡
A pair of matched memory modules installed in DIMM connectors 1 and 2 and another matched pair installed in DIMM connectors 3 and 4
NOTICE: Do not install ECC memory modules.
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If you install mixed pairs of DDR2 400-MHz (PC2-3200) and DDR2 533-MHz (PC2-4200) memory, the modules function at the slowest speed installed.
Similarly, if you install memory modules with mixed CAS Latency (CL) rates, the modules function at the speed and CAS latency capabilities of the
slowest DIMM.
Be sure to install a single memory module in DIMM connector 1, the connector closest to the processor, before you install modules in the other
connectors.
NOTE: Memory purchased from Dell is covered under your computer warranty.
NOTICE: If you remove your original memory modules from the computer during a memory upgrade, keep them separate from any new modules that
you may have, even if you purchased the new modules from Dell. If possible, do not pair an original memory module with a new memory module.
Otherwise, your computer may not start properly. You should install your original memory modules in pairs either in DIMM connectors 1 and 2 or DIMM
connectors 3 and 4.
Addressing Memory With 4-GB Configurations
Your computer supports a maximum of 4 GB of memory when you use four 1-GB DIMMs. Current operating systems, such as Microsoft® Windows® XP, can
only use a maximum of 4 GB of address space; however, the amount of memory available to the operating system is less than 4 GB. Certain components
within the computer require address space in the 4-GB range. Any address space reserved for these components cannot be used by computer memory.
Installing Memory
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.
NOTICE: To prevent static damage to components inside your computer, discharge static electricity from your body before you touch any of your
computer's electronic components. You can do so by touching an unpainted metal surface on the computer chassis.
2. Lay the computer on its side so that the system board is on the bottom of the inside of the computer.
3. Press out the securing clip at each end of the memory module connector.
4. Align the notch on the bottom of the module with the crossbar in the connector.
NOTICE: To avoid damage to the memory module, press the module straight down into the connector while you apply equal force to each end of the
module.
5. Insert the module into the connector until the module snaps into position.
If you insert the module correctly, the securing clips snap into the cutouts at each end of the module.
NOTICE: To connect a network cable, first plug the cable into the network device and then plug it into the computer.
7. Connect your computer and devices to electrical outlets, and turn them on.
8. Right-click the My Computer icon and click Properties.
9. Click the General tab.
10. To verify that the memory is installed correctly, check the amount of memory (RAM) listed.
Removing Memory
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.
NOTICE: To prevent static damage to components inside your computer, discharge static electricity from your body before you touch any of your
computer's electronic components. You can do so by touching an unpainted metal surface on the computer chassis.
2. Press out the securing clip at each end of the memory module connector.
3. Grasp the module and pull up.
If the module is difficult to remove, gently ease the module back and forth to remove it from the connector.
Cards
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.
NOTICE: To prevent static damage to components inside your computer, discharge static electricity from your body before you touch any of your
computer's electronic components. You can do so by touching an unpainted metal surface on the computer chassis.
Your Dell™ computer provides the following slots for PCI and PCI Express cards:
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Three PCI card slots
One PCI Express x16 card slot
One PCI Express x1 card slot
PCI Cards
If you are installing or replacing a card, follow the procedures in the next section. If you are removing but not replacing a PCI card, see "Removing a PCI Card."
If you are replacing a card, remove the current driver for the card from the operating system.
Installing a PCI Card
2. Press the lever on the card retention arm and raise the retention arm.
3. If you are installing a new card, remove the filler bracket to create a card-slot opening. Then continue with step 5.
4. If you are replacing a card that is already installed in the computer, remove the card.
If necessary, disconnect any cables connected to the card. Grasp the card by its top corners, and ease it out of its connector.
5. Prepare the card for installation.
See the documentation that came with the card for information on configuring the card, making internal connections, or otherwise customizing it for your
computer.
CAUTION: Some network adapters automatically start the computer when they are connected to a network. To guard against electrical shock, be
sure to unplug your computer from its electrical outlet before installing any cards.
6. Place the card in the connector and press down firmly. Ensure that the card is fully seated in the slot.
7. Before you lower the retention arm, ensure that:
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The tops of all cards and filler brackets are flush with the alignment bar.
The notch in the top of the card or filler bracket fits around the alignment guide.
8. Press the retention arm into place, securing the card(s) in the computer.
NOTICE: Do not route card cables over or behind the cards. Cables routed over the cards can prevent the computer cover from closing properly or
cause damage to the equipment.
9. Connect any cables that should be attached to the card.
See the documentation for the card for information about the card's cable connections.
NOTICE: To connect a network cable, first plug the cable into the network device and then plug it into the computer.
10. Close the computer cover, reconnect the computer and devices to electrical outlets, and then turn them on.
11. If you installed a sound card:
b. Connect external audio devices to the sound card's connectors. Do not connect external audio devices to the microphone, speaker/headphone,
or line-in connectors on the back panel.
12. If you installed an add-in network adapter and want to disable the integrated network adapter:
b. Connect the network cable to the add-in network adapter's connectors. Do not connect the network cable to the integrated connector on the
back panel.
13. Install any drivers required for the card as described in the card documentation.
Removing a PCI Card
2. Press the lever on the card retention arm and raise the retention arm.
3. If necessary, disconnect any cables connected to the card.
4. Grasp the card by its top corners, and ease it out of its connector.
5. If you are removing the card permanently, install a filler bracket in the empty card-slot opening.
If you need a filler bracket, contact Dell.
NOTE: Installing filler brackets over empty card-slot openings is necessary to maintain FCC certification of the computer. The brackets also keep dust
and dirt out of your computer.
6. Lower the retention arm and press it into place, securing the card(s) in the computer.
NOTICE: To connect a network cable, first plug the cable into the network device and then plug it into the computer.
7. Close the computer cover, reconnect the computer and devices to electrical outlets, and then turn them on.
8. Remove the card's driver from the operating system.
9. If you removed a sound card:
b. Connect external audio devices to the audio connectors on the back panel of the computer.
10. If you removed an add-in network connector:
b. Connect the network cable to the integrated connector on the back panel of the computer.
PCI Express Cards
Your computer supports one PCI Express x16 card and one PCI Express x1 card.
NOTICE: PCI Express graphics cards that run higher than 75 W may require an additional cooling fan. Otherwise, your card could overheat and damage
your computer.
If a card fan is not present in your computer and you are installing a graphics card that runs at 75 W or higher, contact Dell to find out how to purchase a card
fan.
If you are installing or replacing a PCI Express card, follow the procedures in the next section. If you are removing but not replacing a card, see "Removing a
If you are replacing a card, remove the current driver for the card from the operating system.
Installing a PCI Express Card
2. Press the lever on the card retention arm and raise the retention arm.
3. If you are installing a new card, remove the filler bracket to create a card-slot opening. Then continue with step 5.
4. If you are replacing a card that is already installed in the computer, remove the card.
If necessary, disconnect any cables connected to the card. If your card includes a retention mechanism, remove the top of the retention mechanism by
pressing the tab and pulling up on the top. Gently pull the securing tab, grasp the card by its top corners, and then ease it out of its connector.
5. Prepare the card for installation.
See the documentation that came with the card for information on configuring the card, making internal connections, or otherwise customizing it for your
computer.
CAUTION: Some network adapters automatically start the computer when they are connected to a network. To guard against electrical shock, be
sure to unplug your computer from its electrical outlet before installing any cards.
6. If you are installing the card into the x16 card connector, position the card so the securing slot is aligned with the securing tab, and gently pull the
securing tab.
7. Place the card in the connector and press down firmly. Ensure that the card is fully seated in the slot
8. If you replaced a card that was already installed in the computer and you removed the top of the retention mechanism, you may reinstall the top.
9. Before you lower the retention arm, ensure that:
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The tops of all cards and filler brackets are flush with the alignment bar.
The notch in the top of the card or filler bracket fits around the alignment guide.
10. Press the retention arm into place, securing the card(s) in the computer.
NOTICE: Do not route card cables over or behind the cards. Cables routed over the cards can prevent the computer cover from closing properly or
cause damage to the equipment.
If a card fan is not present in your computer and you are installing a graphics card that runs higher than 75 W, contact Dell to find out how to purchase a card
fan.
11. If you installed a PCI Express graphics card that runs at 75 W or higher, install the card fan. Contact Dell to find out how to purchase a card fan.
12. Connect any cables that should be attached to the card.
See the documentation that came with the card for information about the card's cable connections.
NOTICE: To connect a network cable, first plug the cable into the network device and then plug it into the computer.
13. Close the computer cover, reconnect the computer and devices to electrical outlets, and then turn them on.
14. If you installed a sound card:
b. Connect external audio devices to the sound card's connectors. Do not connect external audio devices to the microphone, speaker/headphone,
or line-in connectors on the back panel.
15. If you installed an add-in network adapter and want to disable the integrated network adapter:
b. Connect the network cable to the add-in network adapter's connectors. Do not connect the network cable to the integrated connector on the
back panel.
16. Install any drivers required for the card as described in the card documentation.
Removing a PCI Express Card
2. Press the lever on the card retention arm and raise the retention arm.
3. If necessary, disconnect any cables connected to the card.
4. If your card includes a retention mechanism, remove the top of the retention mechanism by pressing the tab and pulling up on the top.
5. Gently pull back the securing tab, grasp the card by its top corners, and then ease it out of its connector.
6. If you are removing the card permanently, install a filler bracket in the empty card-slot opening.
If you need a filler bracket, contact Dell.
NOTE: Installing filler brackets over empty card-slot openings is necessary to maintain FCC certification of the computer. The brackets also keep dust
and dirt out of your computer.
7. Lower the retention arm and press it into place, securing the card(s) in the computer.
NOTICE: To connect a network cable, first plug the cable into the network device and then plug it into the computer.
8. Close the computer cover, reconnect the computer and devices to electrical outlets, and then turn them on.
9. Remove the card's driver from the operating system.
10. If you removed a sound card:
b. Connect external audio devices to the audio connectors on the back panel of the computer.
11. If you removed an add-in network connector:
b. Connect the network cable to the integrated connector on the back panel of the computer.
12. Install any drivers required for the card as described in the card documentation.
Drives
Your computer supports a combination of these devices:
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Up to two hard drives
One optional floppy drive
Up to two CD or DVD drives
General Installation Guidelines
Connect serial ATA hard drives and serial CD/DVD drives to the system board connectors labeled SATA-0, SATA-1, SATA-2, or SATA-3. Connect IDE CD/DVD
drives to the connector labeled PRI IDE.
When you connect two IDE devices to a single IDE interface cable and configure them for the cable select setting, the device attached to the last connector on
the interface cable is the primary or the boot device (drive 0), and the device attached to the middle connector on the interface cable is the secondary device
(drive 1). See the drive documentation in your upgrade kit for information on configuring devices for the cable select setting.
Connecting Drive Cables
When you install a drive, you connect two cables—a DC power cable and a data cable—to the back of the drive and to the system board. Some drives may
also have an audio connector; one end of the audio cable attaches to the drive connector and the other end attaches to the system board.
Drive Interface Connectors
Serial ATA Connector
Most interface connectors are keyed for correct insertion; that is, a notch or a missing pin on one connector matches a tab or a filled-in hole on the other
connector.
When you connect an IDE cable, ensure that you align the colored stripe with the pin 1 connector. When you disconnect an IDE cable, grasp the colored pull
tab and pull until the connector detaches.
When you connect and disconnect a serial ATA cable, hold the cable by the connector at each end.
NOTE: The system board serial ATA connector may have an attached cover or shroud.
Power Cable Connector
Hard Drive
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.
CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover.
NOTICE: To avoid damage to the drive, do not set it on a hard surface. Instead, set the drive on a surface, such as a foam pad, that will sufficiently
cushion it.
1. If you are replacing a hard drive that contains data you want to keep, back up your files before you begin to remove the hard drive.
Removing a Hard Drive
1. Disconnect the power and data cable from the drive and from the system board.
2. Press in on the tabs on each side of the drive and slide the drive up and out.
Installing a Hard Drive
1. Unpack the replacement hard drive, and prepare it for installation.
2. Check the documentation for the drive to verify that it is configured for your computer.
3. If your replacement hard drive does not have the bracket rails attached, remove the rails from the old drive by removing the two screws that secure
each rail to the drive. Attach the bracket rails to the new drive by aligning the screw holes on the drive with the screw holes on the bracket rails and
then inserting and tightening all four screws (two screws on each rail).
4. Install the hard drive into the computer by gently sliding the drive into place until you hear it securely click.
6. Check all connectors to be certain that they are properly cabled and firmly seated.
NOTICE: To connect a network cable, first plug the cable into the network device and then plug it into the computer.
8. Connect your computer and devices to electrical outlets, and turn them on.
See the documentation that came with the drive for instructions on installing any software required for drive operation.
9. If the drive you just installed is the primary drive, insert a bootable floppy disk into drive A.
10. Turn on the computer.
12. Exit system setup, and restart the computer.
13. Partition and logically format your drive before you proceed to the next step.
See the documentation for your operating system for instructions.
14. Test the hard drive by running the Dell Diagnostics.
15. If the drive you just installed is the primary drive, install your operating system on the hard drive.
Adding a Second Hard Drive
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.
CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover.
NOTICE: To avoid damage to the drive, do not set it on a hard surface. Instead, set the drive on a surface, such as a foam pad, that will sufficiently
cushion it.
1. Check the documentation for the drive to verify that it is configured for your computer.
3. Remove the two plastic rails from the inside of the hard-drive bay by gently pulling the rails up and out of the bay.
4. Attach the rails to the hard drive using the two screws attached to the rails.
Ensure that the rail tabs are positioned at the back of the hard drive.
NOTICE: Do not install any drive into the lower hard-drive bay until you have removed the green drive rails from the inside of the hard-drive bay.
5. Remove the first hard drive from the upper bay and install it in the lower bay:
a. Disconnect the power and the data cable from the back of the first hard drive.
b. Press in the two rail tabs and pull the first hard drive out of the upper bay.
c. Gently slide the first hard drive into the lower bay until you hear a click.
d. Reconnect the power and data cable to the back of the first hard drive.
6. Gently slide the new hard drive into the upper bay until you hear a click.
7. Connect a power cable to the drive.
9. Close the computer cover.
NOTICE: To connect a network cable, first plug the cable into the network device and then plug it into the computer.
10. Connect your computer and devices to their electrical outlets, and turn them on.
See the documentation that came with the drive for instructions on installing any software required for drive operation.
Front-Panel Inserts
If you are installing a new floppy or CD/DVD drive instead of replacing a drive, remove the front-panel inserts.
1. Open the cover to a 90-degree angle.
2. Locate the insert that is in front of the drive bay that you want to use.
3. From inside the computer, press in the release tab of the insert.
4. From the outside of the computer, pull the insert away from the computer's front panel.
5. Remove the insert from the insert frame by pressing on the four tabs.
6. Reattach the empty insert frame over the front of the drive bay.
The insert frame fits only one way.
a. Face the front of the computer and slip the left side of the insert in to the left side of the drive bay opening.
b. Slightly press the right-side insert release tab and gently push in the insert.
If you are adding a floppy drive and you purchased the drive from Dell, you received a front panel insert in your floppy drive kit. Attach this insert over the front
of the drive bay.
If you are adding a floppy drive that was not purchased from Dell, reattach the empty insert frame over the front of the drive bay.
Floppy Drive
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.
CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover.
Removing a Floppy Drive
1. Disconnect the power and data cables from the back of the floppy drive.
2. Disconnect the other end of the data cable from the system board.
3. Press inward on the two tabs on the sides of the drive, slide the drive upward, and then remove it from the floppy-drive bay.
Installing a Floppy Drive
1. If you are replacing a drive and the new drive does not have the bracket rails attached, remove the rails from the old drive by removing the two screws
that secure each rail to the drive. Attach the bracket to the new drive by aligning the screw holes on the drive with the screw holes on the bracket rails
and then inserting and tightening all four screws (two screws on each rail).
2. Gently slide the drive into place until the tabs securely click into position.
3. Attach the power and data cables to the floppy drive.
5. If you are installing a new floppy drive rather than replacing a drive, remove the front-panel inserts.
6. Check all cable connections, and fold cables out of the way to provide airflow for the fan and cooling vents.
NOTICE: To connect a network cable, first plug the cable in to the network device and then plug it in to the computer.
8. Connect your computer and devices to their electrical outlets, and turn them on.
See the documentation that came with the drive for instructions on installing any software required for drive operation.
10. Verify that your computer works correctly by running the Dell Diagnostics.
CD/DVD Drive
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.
CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover.
Removing a CD/DVD Drive
2. Disconnect the power and data cables from the back of the drive.
3. Press inward on the two tabs on the sides of the drive, and then slide the drive upward and remove it from the drive bay.
Installing a CD/DVD Drive
1. If you are installing a new drive, unpack the drive and prepare it for installation.
Check the documentation that accompanied the drive to verify that the drive is configured for your computer. If you are installing an IDE drive, configure
the drive for the cable select setting.
2. Connect the new drive to the set of rails that are attached to the inside of the cover. If a set of rails is not attached inside the cover, contact Dell.
3. If you are installing a replacement drive and the new drive does not have the bracket rails attached, remove the rails from the old drive by removing the
two screws that secure each rail to the drive. Attach the bracket to the new drive by aligning the screw holes on the drive with the screw holes on the
bracket rails and then inserting and tightening all four screws (two screws on each rail).
4. Gently slide the drive into place until the tabs securely click into position.
5. Connect the power and data cables to the drive.
7. Check all cable connections, and fold cables out of the way to provide airflow for the fan and cooling vents.
NOTICE: To connect a network cable, first plug the cable in to the network device and then plug it in to the computer.
9. Connect your computer and devices to their electrical outlets, and turn them on.
See the documentation that came with the drive for instructions on installing any software required for drive operation.
11. Verify that your computer works correctly by running the Dell Diagnostics.
Airflow Shroud
Removing the Airflow Shroud
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.
2. Disconnect the cooling fan power cable from the fan connector on the system board.
3. Disconnect the power cable from the power connector on the system board.
4. Lift up the airflow shroud.
Processor
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.
NOTICE:
CAUTION: The heat sink can get very hot during normal operation. Be sure that the heat sink has had sufficient time to cool before you touch it.
2. Remove the heat sink:
a. Remove the retention module clips. Press the tabs toward the center of the clip and lift up.
b. On the retention base locate the tab opposite the power supply. Press on the retention base tab until the heat sink pops up slightly.
c. Press out on the second retention tab while lifting the heat sink up and out of the retention base.
NOTICE: Lay the heat sink down on its side.Do not touch or remove the thermal grease on the bottom of the heat sink.
NOTICE: If you are installing a processor upgrade kit from Dell, discard the original heat sink. If you are not installing a processor upgrade kit from Dell,
reuse the original heat sink and blower when you install your new processor.
3. Push down and out on the socket release lever.
4. Open the processor cover.
5. To remove the processor from the socket, lift the processor vertically in one motion.
Leave the release lever extended in the release position so that the socket is ready for the new processor.
Installing the Processor
NOTICE: Ground yourself by touching an unpainted metal surface on the back of the computer.
1. Unpack the new processor.
NOTICE: You must position the processor correctly in the socket to avoid permanent damage to the processor and the computer when you turn on the
computer.
2. If the release lever on the socket is not fully extended, move it to that position.
3. Align the pin-1 corners of the processor and socket.
NOTICE: To avoid damage, ensure that the processor aligns properly with the socket, and do not use excessive force when you install the processor.
NOTICE: Be careful not to touch or bend the pins on the system board.
4. Set the processor lightly in the socket and ensure that the processor is level in the socket. When the processor is positioned correctly, press it with
minimal pressure to seat it.
5. When the processor is fully seated in the socket, close the processor cover.
Ensure that the tab on the processor cover is positioned underneath the center cover latch on the socket.
6. Pivot the socket release lever back toward the socket and snap it into place to secure the processor.
NOTICE: If you are not installing a processor upgrade kit from Dell, reuse the original heat sink assembly when you replace the processor.
If you installed a processor replacement kit from Dell, return the original heat sink assembly and processor to Dell in the same package in which your
replacement kit was sent.
7. Install the heat sink:
a. Slide one end of the heat sink under the retention tab.
b. Pull out the other retention tab and lower the heat sink until it fits securely in the base.
NOTICE: Ensure the heat sink is correctly seated and secure.
8. Reinstall the retention module clips.
9. Lower the airflow shroud over the heat sink.
10. Reconnect the cooling fan power cable to the fan connector on the system board.
11. Reconnect the power cable to the power connector on the system board.
NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer.
13. Connect your computer and devices to electrical outlets, and turn them on.
System Board
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.
CAUTION: To prevent static damage to components inside your computer, discharge static electricity from your body before you touch any of
your computer's electronic components. You can do so by touching an unpainted metal surface on the computer chassis.
NOTICE: The system board and metal tray are connected and are removed as one piece.
Removing the System Board
3. Remove any components that restrict access to the system board.
4. Disconnect all cables from the system board.
5. Before you remove the existing system board assembly, visually compare the replacement system board to the existing system board to make sure that
you have the correct part.
6. Remove the system board screw.
7. Pull up on the two tabs, slide the system board assembly toward the front of the computer, and then lift the asembly up and away.
8. Place the system board assembly that you just removed next to the replacement system board.
Replacing the System Board
1. Transfer components from the existing system board to the replacement system board:
b. Install them on the replacement board.
CAUTION: The processor package and heat-sink assembly can get hot. To avoid burns, ensure that the package and assembly have had sufficient
time to cool before you touch them.
c. Remove the heat-sink assembly and processor from the existing system board and transfer them to the replacement system board.
2. Configure the settings of the replacement system board.
3. Set the jumpers on the replacement system board so they are identical to the ones on the existing board.
NOTE: Some components and connectors on the replacement system board may be in different locations than the corresponding connectors on the
existing system board.
4. Orient the replacement board by aligning the notches on the bottom of the board with the tabs on the computer.
5. Slide the system board assembly toward the back of the computer until the assembly clicks into position.
6. Replace any components and cables that you removed from the system board.
7. Reconnect all cables to their connectors at the back of the computer.
NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer.
9. Connect your computer and devices to electrical outlets, and turn them on.
Power Supply
Removing the Power Supply
NOTICE: To prevent static damage to components inside your computer, discharge static electricity from your body before you touch any of your
computer's electronic components. You can do so by touching an unpainted metal surface on the computer chassis.
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.
2. Disconnect the DC power cables from the system board and the drives.
Note the routing of the DC power cables underneath the tabs in the computer frame as you remove them from the system board and drives. You must
route these cables properly when you replace them to prevent their being pinched or crimped.
3. Remove the two screws that attach the power supply to the back of the computer frame.
4. Press the release button located on the floor of the computer frame.
5. Slide the power supply toward the front of the computer approximately 1 inch.
6. Lift the power supply up and out of the computer.
Replacing the Power Supply
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.
1. Slide the power supply into place.
2. Replace the two screws that secure the power supply to the back of the computer frame.
3. Reconnect the DC power cables.
4. Connect the AC power cable to the connector.
5. Run the cables underneath the clips, and press the clips to close them over the cables.
NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer.
7. Connect your computer and devices to electrical outlets, and turn them on.
Battery
Replacing the Battery
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.
NOTICE: To prevent static damage to components inside your computer, discharge static electricity from your body before you touch any of your
computer's electronic components. You can do so by touching an unpainted metal surface on the computer chassis.
A coin-cell battery maintains computer configuration, date, and time information. The battery can last several years.
If you have to repeatedly reset time and date information after turning on the computer, replace the battery.
CAUTION: A new battery can explode if it is incorrectly installed. Replace the battery only with the same or equivalent type recommended by the
manufacturer. Discard used batteries according to the manufacturer's instructions.
To replace the battery:
4. Remove the battery by pressing on the tab, which will release the battery from the battery socket.
5. Insert the new battery into the socket with the side labeled "+" facing up, and snap the battery into place.
6. Close the computer cover.
NOTICE: To connect a network cable, first plug the cable into the network device and then plug it into the computer.
7. Connect your computer and devices to electrical outlets, and turn them on.
9. Properly dispose of the old battery. See the Product Information Guide for battery disposal information.
Specifications
Dell™ Dimension™ 8400 Service Manual
Processor
Processor type
Intel® Pentium® 4 with HT Technology
NOTE: Not all Pentium 4 processors support Hyper-
Threading technology.
Level 1 (L1) cache
16 KB
Level 2 (L2 or L3) cache
512 KB, 1 MB, or 2 MB (depending on your computer
configuration) pipelined-burst, eight-way set
associative, write-back SRAM
Memory
Type
400- and 533-MHz DDR2 unbuffered SDRAM
Memory connectors
Memory capacities
Maximum memory
four
128-, 256-, 512-, or 1-GB non-ECC
4 GB
available to the operating system.
BIOS address
F0000h
Computer Information
Chipset
Intel 925X Express or Intel 925XE Express
DMA channels
Interrupt levels
BIOS chip (NVRAM)
NIC
eight
24
4-Mb
Integrated network interface capable of 10/100/1000
communication.
System clock
800- or 1066-MHz data rate (depending on your
processor)
Video
Type
PCI Express
Audio
Type
ADI 1980 AC'97 Codec
NOTE: This audio type is present only on computers
with integrated sound capabilities.
Expansion Bus
Bus type
PCI 2.3
PCI Express x1 and x16
Bus speed
PCI: 33 MHz
PCI Express:
x1 slot bidirectional speed — 500 MB/s
x16 slot bidirectional speed — 8 GB/s
PCI
connector
three
connector size
120 pins
32 bits
connector data width (maximum)
PCI Express
connector
one x1
connector size
36 pins
connector data width (maximum)
1 PCI Express lane
PCI Express
connectors
one x16
connector size
164 pins
connector data width (maximum)
16 PCI Express lanes
Drives
Externally accessible:
two 3.5-inch drive bays
two 5.25-inch drive bays
Available devices
Serial ATA drive, floppy drive, Zip drive, USB memory
devices, CD drive, CD-RW drive, DVD drive, DVD-RW
drive, and DVD and CD-RW combo drive
Internally accessible:
two bays for 1-inch high hard drives
Connectors
External connectors:
Serial
9-pin connector; 16550C-compatible
25-hole connector (bidirectional)
15-hole connector
Parallel
Video
Network adapter
RJ45 connector
PS/2 (keyboard and mouse)
two 6-pin mini-DIN connectors
USB
two front-panel and six back-panel USB 2.0–
compliant connectors
Audio
five connectors for line-in, line-out, microphone,
surround, and center/Low Frequency Effects (LFE)
channel; one front-panel connector for headphones
System board connectors:
Primary IDE drive
Serial ATA
40-pin connector on PCI local bus
four 7-pin connectors
34-pin connector
Floppy drive
Fan
two 5-pin connectors
120-pin connector
PCI 2.3
PCI Express x1
PCI Express x16
Telephony (TAPI)
36-pin connector
164-pin connector
4-pin connector
Controls and Lights
Power control
Power light
push button
green light — Blinking green in sleep state; solid
green for power-on state.
amber light — Blinking amber indicates a problem
with an installed device; solid amber indicates an
Hard-drive access light
green
Link integrity light (on integrated network adapter)
green light — A good connection exists between a
10-Mbps network and the computer.
orange light — A good connection exists between a
100-Mbps network and the computer.
yellow light — A good connection exists between a 1
Gb (or 1000-Mbps) network and the computer.
off (no light) — The computer is not detecting a
physical connection to the network.
Activity light (on integrated network adapter)
Diagnostic lights
yellow blinking light
Standby power light
AUX_PWR on the system board
Power
DC power supply:
Wattage
350 W
Heat dissipation
460.7 BTU/hr
Voltage (see the safety instructions located in
the Product Information Guide for important
voltage setting information)
fixed-voltage power supply — 110 V at 50/60 Hz
manual selection and auto-sensing power supplies —
90 to 135 V at 50/60 Hz; 180 to 265 V at 50/60 Hz;
100 V at 50/60 Hz for Japanese computers
Backup battery
3-V CR2032 lithium coin cell
Physical
Height
Width
42.5 cm (16.7 inches)
18.1 cm (7.1 inches)
44.7 cm (17.6 inches)
12.7 kg (28 lb)
Depth
Weight
Environmental
Temperature:
Operating
10° to 35°C (50° to 95°F)
NOTE: At 35°C (95°F), the maximum operating
altitude is 914 m (3000 ft).
Storage
Relative humidity
Maximum vibration:
Operating
–40° to 65°C (–40° to 149°F)
20% to 80% (noncondensing)
0.25 G at 3 to 200 Hz at 0.5 octave/min
0.5 G at 3 to 200 Hz at 1 octave/min
Storage
Maximum shock:
Operating
bottom half-sine pulse with a change in velocity of 20
inches/sec (50.8 cm/sec)
Storage
27-G faired square wave with a velocity change of
200 inches/sec (508 cm/sec)
Altitude:
Operating
Storage
–15.2 to 3048 m (–50 to 10,000 ft)
–15.2 to 10,668 m (–50 to 35,000 ft)
System Setup
Dell™ Dimension™ 8400 Service Manual
Overview
Use system setup as follows:
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To change the system configuration information after you add, change, or remove any hardware in your computer
To set or change a user-selectable option such as the user password
To read the current amount of memory or set the type of hard drive installed
Before you use system setup, it is recommended that you write down the system setup screen information for future reference.
NOTICE: Unless you are an expert computer user, do not change the settings for this program. Certain changes can make your computer work
incorrectly.
Entering System Setup
1. Turn on (or restart) your computer.
2. When the blue DELL™ logo appears, press <F2> immediately.
3. If you wait too long and the operating system logo appears, continue to wait until you see the Microsoft® Windows® desktop. Turn off your computer.
and try again.
System Setup Screens
The system setup screen displays current or changeable configuration information for your computer. Information on the screen is divided into three areas: the
options list, active options field, and key functions.
Option Field — This field contains information about each
option. In this field you can view your current settings and
make changes to your settings.
Options List — This field appears on the left side of the system setup window. The field is a
scrollable list containing features that define the configuration of your computer, including
installed hardware, power conservation, and security features.
Use the right and left arrow keys to highlight an option.
Press <Enter> to make that selection active.
Scroll up and down the list with the up- and down-arrow keys. As an option is highlighted, the
Option Field displays more information about that option and the option's current and
available settings.
Key Functions — This field appears below the Option Field
and lists keys and their functions within the active system
setup field.
System Setup Options
NOTE: Depending on your computer and installed devices, the items listed in this section may not appear, or may not appear exactly as listed.
System
Identifies whether the computer's processor supports Hyper-Threading and lists the processor bus speed, processor ID, clock speed, and
L2 cache.
CPU Info
Memory Info
Indicates amount of installed memory, memory speed, channel mode (dual or single), and type of memory installed.
Date/Time
Displays current date and time settings.
The computer attempts to boot from the sequence of devices specified in this list.
Boot Sequence
NOTE: If you insert a boot device and restart the computer, this option appears in the system setup menu. To boot from a USB memory
device, select the USB device and move it so it becomes the first device in the list.
Drives
Diskette Drive
Identifies and defines the floppy drive attached to the FLOPPY connector on the system board as Off, USB, Internal, or Read Only.
Drives 0
through 5
Identifies the drives attached to the SATA or PRI IDE connectors on the system board, and lists the capacity for hard drives.
Drive
Identifies and defines the SATA controller settings for RAID. You can set the SATA controller to RAID Autodetect/AHCI, RAID
Controller
Autodetect/ATA, or RAID On.
Onboard Devices
You can set the NIC to On (default), Off, or On w/ PXE. When the On w/ PXE setting is active (available only for the future boot
process), the computer prompts the user to press <Ctrl><Alt><b>. Pressing this key combination causes a menu to display that allows
you to select a method for booting from a network server. If a boot routine is not available from the network server, the computer
attempts to boot from the next device in the boot sequence list.
NIC Controller
Audio
Controller
Enables or disables the onboard audio controller.
USB
Set to On (default) so that USB devices will be detected and supported in the operating system.
Enables or disables the onboard PS/2-compatible mouse controller.
Mouse Port
LPT Port Mode
Identifies and defines the parallel port settings. You can set the parallel port to Off, AT, PS/2, EPP, or ECP.
LPT Port
Address
Identifies the address for the parallel port.
LPT Port DMA
Identifies and defines the parallel port DMA settings. You can set the parallel port DMA to Off, DMA1, or DMA3.
Identifies and defines the serial port settings. Auto, the default setting, automatically configures a connector to a particular designation
(COM1 or COM3).
Serial Port #1
Video
Primary Video
Performance
HyperThreading
This setting specifies which video controller is primary when two video controllers are present on the computer.
If your computer's processor supports Hyper-Threading, this option appears in the Options List.
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Bypass — Your computer does not test or change the current acoustics mode setting.
Quiet (default) — The hard drive operates at its most quiet setting.
Suggested — The hard drive operates at the level suggested by the drive manufacturer.
Performance — The hard drive operates at its maximum speed.
Performance
NOTE: Switching to performance mode may cause the drive to be noisier, but its performance is not affected.
NOTE: Changing the acoustics setting does not alter your hard drive image.
Security
This section displays available system security options.
This option provides restricted access to the computer's system setup program in the same way that access to the system can be
restricted with the System Password option.
Admin Password
System Password
Password Status
Displays the current status of the system's password security feature and allows a new system password to be assigned and verified.
This option locks the system password field with the setup password. When the field is locked, you can no longer disable password
security by pressing <Ctrl><Enter> when the computer starts.
Power Management
AC Recovery
Determines what happens when AC power is restored to the computer.
Sets the computer to automatically turn on. Choices are every day or every Monday through Friday.
Auto Power On
The default setting is Off.
This feature does not work if you turn off your computer using a power strip or surge protector.
Sets time to automatically turn on the computer.
Time is kept in a 24-hour format (hours:minutes). Change the start-up time by pressing the right- or left-arrow key to increase or decrease
the numbers, or type numbers in both the date and time fields.
Auto Power Time
Low Power Mode
This feature does not work if you turn off your computer using a power strip or surge protector.
When Low Power Mode is selected, remote wakeup events no longer power up from Hibernate or Off.
This option allows the computer to power up when a NIC or Remote Wakeup-capable modem receives a wake up signal.
On is the default setting. On w/ Boot to NIC allows the computer to attempt to boot from a network prior to using the boot sequence.
Remote Wake Up
NOTE: Normally, the system can be powered up remotely from suspend mode, hibernate mode, or when powered off. When Low Power
Mode (in the Power Management menu) is enabled, the computer can only be powered up remotely from Suspend.
The options are S1, a suspend state where the computer is running in a low-power mode, and S3, a standby state where the power is
reduced or turned off for most components, however, system memory remains active.
Suspend Mode
Maintenance
CMOS Defaults
This setting restores the computer's factory-installed default settings.
Event Log
Displays the system event log.
After downloading a new version of the BIOS, use this option to identify and define the location of the BIOS update file. The options are
Diskette or Disk.
BIOS Update
POST Behavior
Fastboot
When set to On (default), your computer starts more quickly because it skips certain configurations and tests.
This option involves the rightmost bank of keys on your keyboard. When set to On (default), this option activates the numeric and
mathematical features shown at the top of each key. When set to Off, this option activates the cursor-control functions labeled on the
bottom of each key.
Numlock Key
OS Install
This setting turns the OS Install Mode either On or Off (default).
POST Hotkeys
Keyboard Errors
This option allows you to specify the function keys to display on the screen when the computer starts.
This option disables or enables keyboard error reporting when the computer starts.
Boot Sequence
This feature allows you to change the boot sequence for devices.
Option Settings
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Diskette Drive — The computer attempts to boot from the floppy drive. If the floppy disk in the drive is not bootable, if no floppy disk is in the drive, or if
there is no floppy drive installed in the computer, the computer generates an error message.
Hard Drive — The computer attempts to boot from the primary hard drive. If no operating system is on the drive, the computer generates an error
message.
CD Drive — The computer attempts to boot from the CD drive. If no CD is in the drive, or if the CD has no operating system, the computer generates an
error message.
USB Flash Device — Insert the memory device into a USB port and restart the computer. When F12 = Boot Menu appears in the upper-right corner of
the screen, press <F12>. The BIOS detects the device and adds the USB flash option to the boot menu.
NOTE: To boot to a USB device, the device must be bootable. To make sure that your device is bootable, check the device documentation.
Changing Boot Sequence for the Current Boot
You can use this feature, for example, to tell the computer to restart your computer to a USB device such as a floppy drive, memory key, or CD-RW drive.
NOTE: If you are booting to a USB floppy drive, you must first set the floppy drive to OFF in system setup.
1. If you are booting to a USB device, connect the USB device to a USB connector.
2. Turn on (or restart) your computer.
3. When F2 = Setup, F12 = Boot Menu appears in the upper-right corner of the screen, press <F12>.
If you wait too long and the operating system logo appears, continue to wait until you see the Microsoft Windows desktop. Then shut down your
The Boot Device Menu appears, listing all available boot devices. Each device has a number next to it.
4. At the bottom of the menu, enter the number of the device that is to be used for the current boot only.
For example, if you are booting to a USB memory key, highlight USB Flash Device and press <Enter>.
NOTE: To boot to a USB device, the device must be bootable. To make sure your device is bootable, check the device documentation.
Changing Boot Sequence for Future Boots
2. Use the arrow keys to highlight the Boot Sequence menu option and press <Enter> to access the menu.
NOTE: Write down your current boot sequence in case you want to restore it.
3. Press the up- and down-arrow keys to move through the list of devices.
4. Press the spacebar to enable or disable a device (enabled devices have a checkmark).
5. Press plus (+) or minus (–) to move a selected device up or down the list.
Clearing Forgotten Passwords
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.
2. Locate the 3-pin password jumper (PASS) on the system board, and attach the jumper plug to pins 2 and 3 to clear the password.
NOTE: When you receive your computer, the jumper plug is attached to pins 1 and 2.
4. Connect your computer and monitor to electrical outlets, and turn them on.
6. Turn off the monitor and disconnect it from the electrical outlet.
7. Disconnect the computer power cable from the electrical outlet, and press the power button to ground the system board.
9. Locate the 3-pin password jumper (PASS) on the system board and attach the jumper to pins 1 and 2 to re-enable the password feature.
NOTICE: To connect a network cable, first plug the cable into the network device and then plug it into the computer.
11. Connect your computer and devices to electrical outlets, and turn them on.
Clearing CMOS Settings
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.
2. Reset the current CMOS settings:
b. Remove the jumper plug from pins 2 and 3.
c. Place the jumper plug on pins 1 and 2 and wait approximately 5 seconds.
d. Replace the jumper plug on pins 2 and 3.
NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer.
4. Connect your computer and devices to electrical outlets, and turn them on.
Pin Number
Signal name
+3.3 VDC
+3.3 VDC
COM
Color
Orange
Orange
Black
Red
Wire Gauge
16-AWG
16-AWG
18-AWG
18-AWG
18-AWG
18-AWG
18-AWG
18-AWG
18-AWG
18-AWG
18-AWG
16-AWG
16-AWG
18-AWG
18-AWG
18-AWG
18-AWG
18-AWG
18-AWG
18-AWG
18-AWG
18-AWG
18-AWG
18-AWG
1
2
3
4
+5 VDC
COM
5
Black
Red
6
+5 BDC
COM
7
Black
Gray
8
POK
9
+5 VFP
+12 VB DC
+12VB DC
+3.3 VDC
+3.3 VDC
-12 VDC
COM
Purple
White
White
Orange
Orange
Blue
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Black
Green
Black
Black
Black
N/C
PS-ON
COM
COM
COM
N/C
+5 VDC
+5 VDC
+5 VDC
COM
Red
Red
Red
Black
DC Power Connector P2
Pin Number
Signal Name
COM
18-AWG Wire
1
2
3
4
Black
COM
Black
+12 VA DC
+12 VA DC
Yellow
Yellow
DC Power Connectors, P3 and P5
Pin Number
Signal Name
18-AWG Wire
1
+3.3 VDC
Orange
2
3
4
5
COM
Black
Red
+5 VDC
COM
Black
White
+12 VB DC
DC Power Connector P4
Pin Number
Signal Name
N/C
18-AWG Wire
N/C
1
2
3
4
5
6
COM
Black
COM
Black
+3.3 VDC
+5 VDC
+12B VDC
Orange
Red
White
DC Power Connector P6
Pin Number
Signal Name
+12 VB DC
COM
18-AWG Wire
Yellow
1
2
3
4
Black
COM
Black
+5V DC
Red
DC Power Connector P7
Pin Number
Signal Name
+5 VDC
COM
18-AWG Wire
Red
1
2
3
4
Black
COM
Black
+12 A VDC
Yellow
DC Power Connectors, P8 and P9
Pin Number
Signal Name
18-AWG Wire
1
2
3
4
+12 VB DC
COM
White
Black
Black
Red
COM
+5V DC
DC Power Connector P10
Pin Number
Signal Name
+12 B VDC
+12 B VDC
+12 B VDC
COM
18-AWG Wire
White
1
2
3
4
5
6
White
White
Black
COM
Black
COM
Black
NOTE: The P10 connector is intended for use with PCI Express graphics cards that have power requirements exceeding 75 watts.
Dell™ Dimension™ 8400 Systems Service Manual
Notes, Notices, and Cautions
NOTE: A NOTE indicates important information that helps you make better use of your computer.
NOTICE: A NOTICE indicates either potential damage to hardware or loss of data and tells you how to avoid the problem.
CAUTION: A CAUTION indicates a potential for property damage, personal injury, or death.
Abbreviations and Acronyms
For a complete list of abbreviations and acronyms, see the Dell Dimension Owner's Manual.
If you purchased a Dell™ n Series computer, any references in this document to Microsoft® Windows® operating systems are not applicable.
Information in this document is subject to change without notice.
© 2004 Dell Inc. All rights reserved.
Reproduction in any manner whatsoever without the written permission of Dell Inc. is strictly forbidden.
Trademarks used in this text: Dell, the DELL logo, Inspiron, Dell Precision, Dimension, OptiPlex, Latitude, PowerEdge, PowerVault, PowerApp, and Dell OpenManage are trademarks of Dell
Inc.; Intel and Pentium are registered trademarks of Intel Corporation; Microsoft, Windows, and MS-DOS are registered trademarks of Microsoft Corporation.
Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or their products. Dell Inc. disclaims any
proprietary interest in trademarks and trade names other than its own.
Model DHM
October 2004
Rev. A00
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