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Troubleshooting Tools 43
Troubleshooting Tools
Diagnostic Lights
CAUTION: Before you begin 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 page 57). 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 computer successfully
boots to the operating system.
Plug the computer into a working electrical outlet
and press the power button. Also see "Power
Problems" on page 36.
A possible processor failure
has occurred.
Contact Dell (see page 116).
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 page 64), 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 page 64).
• If the problem persists, contact Dell
(see
page 116
).