Dell XPS 400/Dimension 9150 - Manual (Page 21)

Advanced Troubleshooting: Dell XPS 400 Service Manual
file:///T|/htdocs/systems/xps400/sm/adtshoot.htm[8/3/2012 3:11:19 PM]
To help you troubleshoot a problem, your computer has four lights labeled "1," "2," "3," and "4" on the front panel (see
" Front View of the Computer "). When the computer starts normally, the lights flash. After the computer starts, all four lights
display solid green. If the computer malfunctions, the color and sequence of the lights identify the problem.
Light Pattern Problem Description Suggested Resolution
The computer is in a
normal "off" condition
or a possible pre-BIOS
failure has occurred.
The diagnostic lights
are not lit after the
system successfully
boots to the operating
system.
Plug the computer into a working electrical outlet. Also see " Power Lights ."
A possible processor
failure has occurred.
Reinstall the processor and restart the computer.
Memory modules are
detected, but a
memory failure has
occurred.
If you have two or more memory modules installed, remove the modules,
reinstall one module (see " Memory "), 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 (see " Memory ").
If the problem persists, contact Dell.
A possible graphics
card failure has
occurred.
If the computer has a graphics card, remove the card (see " Cards "),
reinstall it, 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, contact Dell.
A possible floppy drive
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.
If you have two or more memory modules installed, remove the modules,
reinstall one module (see " Memory "), 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 (see " Memory ").
If the problem persists, contact Dell.
Memory modules are
detected, but a
memory configuration
or compatibility error
exists.
Ensure that no special memory module/memory connector placement
requirements exist (see " Memory ").
Verify that the memory modules that you are installing are compatible
with your computer (see " Memory ").
If the problem persists, contact Dell.
A possible expansion
card failure has
occurred.
1. Determine if a conflict exists by removing a card (not a graphics card)
and restarting the computer (see " Cards ").
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 (see " Cards ").
4. If the problem persists, contact Dell.