Dell Dimension 9150 Service Manual page 21

Advanced Troubleshooting: Dell Dimension 9150 Service Manual
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
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.
A possible processor
failure has occurred.
Memory modules are
detected, but a
memory failure has
occurred.
A possible graphics
card failure has
occurred.
A possible floppy drive
or hard drive failure
has occurred.
A possible USB failure
has occurred.
No memory modules
are detected.
Memory modules are
detected, but a
memory configuration
or compatibility error
exists.
A possible expansion
card failure has
occurred.
file:///T|/htdocs/systems/dim9150/en/sm/adtshoot.htm[10/31/2012 7:59:03 AM]
Suggested Resolution
Plug the computer into a working electrical outlet. Also see
Reinstall the processor and restart the computer.
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.
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.
Reseat all power and data cables and restart the computer.
Reinstall all USB devices, check cable connections, and then restart the
computer.
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.
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.
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.
"Power Lights."