Diagnostic Lights; Diagnostic Light Codes During Post - Dell Precision T3400 Quick Reference Manual

Diagnostic Lights

CAUTION:
Before you begin any of the procedures in this section, follow the
safety instructions in the
To help troubleshoot a problem, your computer has four lights labeled 1, 2, 3,
and 4 on the front panel (see "Front View (Tower Orientation)" on page 11 or
"Front View (Desktop Orientation)" on page 15). When the computer starts
normally, the lights flash, and then turn off. If the computer malfunctions,
use the sequence of the lights to help identify the problem.
NOTE:
After the computer completes POST, all four lights turn off before booting to
the operating system.

Diagnostic Light Codes During POST

Light Pattern
Product Information Guide
Problem Description
The computer is in a
normal off condition
or a possible pre-BIOS
failure has occurred.
A possible BIOS
failure has occurred;
the computer is in the
recovery mode.
A possible processor
failure has occurred.
.
Suggested Resolution
Plug the computer into a working
electrical outlet and press the power
button.
• Run the BIOS Recovery utility, wait
for recovery completion, and then
restart the computer.
• If the problem persists, contact Dell
(see "Contacting Dell" in your User's
Guide).
• Reseat the processor (see "Processor"
in your User's Guide).
• If the problem persists, contact Dell
(see "Contacting Dell" in your User's
Guide).
Quick Reference Guide
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