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Troubleshooting Tools 65
Troubleshooting Tools
Diagnostic Lights
CAUTION: Before you perform any of the procedures in this section, follow the safety instructions 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 of the Computer" 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.
Light Pattern Problem Description Suggested Resolution
The computer is in a normal "off"
condition or a possible pre-BIOS failure
has occurred.
All four diagnostic lights display solid
green and then turn off after the system
successfully boots to the operating
system.
• Plug the computer into a working
electrical outlet (see "Power Problems"
on page 58).
• If the problem persists, contact Dell
(see "Contacting Dell" on page 135).
A possible processor failure has occurred. Contact Dell (see "Contacting Dell" on
page 135).