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Troubleshooting Tools 49
Troubleshooting Tools
Diagnostic Lights
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in
the Product Information Guide.
To help you troubleshoot a problem, your computer has four lights labeled 1, 2, 3, and 4 on the front
panel (see "Front View" on page 13). When the computer starts normally, the lights flash before
turning off. If the computer malfunctions, the sequence of the lights identify the problem.
NOTE: After the computer completes POST, all four lights turn off before booting to the operating system.
Light Pattern Problem Description Suggested Resolution
The computer is in a normal off
condition or a possible pre-BIOS failure
has occurred.
• Plug the computer into a working
electrical outlet (see "Power Problems"
on page 43).
• If the problem persists, contact Dell
(see "Contacting Dell" on page 112).
A possible processor failure has occurred. Contact Dell (see "Contacting Dell" on
page 112).
Memory modules are detected, but a
memory failure has occurred.
• If two or more memory modules are
installed, remove the modules (see
"Removing Memory" on page 70), then
reinstall one module (see "Installing
Memory" on page 68) and restart the
computer. If the computer starts
normally, continue to install additional
memory modules (one at a time) 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 "Installing Memory" on
page 68).
• If the problem persists, contact Dell
(see "Contacting Dell" on page 112).