Advanced Troubleshooting 61
Advanced Troubleshooting
Diagnostic Lights
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the
Product Information Guide.
To help 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 help to 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.
The diagnostic lights are not lit after the
system successfully boots to the operating
system.
• Plug the computer into a working electrical
outlet (see "Power Problems" on page 54).
• If the problem persists, contact Dell (see
"Contacting Dell
" on page 145).
A possible processor failure has occurred.
• Reseat the processor (see "Processor" on
page 120).
• If the problem persists, contact Dell (see
"Contacting Dell
" on page 145).
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 84), then
reinstall one module (see "Installing
Memory" on page 82) 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 working memory of the
same type into your computer (see
"Installing Memory" on page 82).
• If the problem persists, contact Dell (see
"Contacting Dell
" on page 145).
book.book Page 61 Thursday, July 20, 2006 11:10 AM
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