28 Setup and Quick Reference Guide
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Diagnostic Lights

To help you troubleshoot a problem, your computer is equipped with four lights labeled "A,"

"B," "C," and "D." Diagnostic lights are located on the back of the mini-tower computer and

on the front of the desktop computer. When the computer starts normally, the lights flash.

After the computer starts, all four lights will display solid green. If the computer

malfunctions, the color and sequence of the lights identify the problem.

Solid green power
light and no beep
code and no video
during POST
N/A The monitor or the graphics card
may be faulty or incorrectly
installed.
Check the diagnostic lights to see if
the specific problem is identified.
See "Video and Monitor Problems"
in your User’s Guide.
Solid green power
light and no beep
code, but the
computer locks
up during POST
N/A An integrated system board device
may be faulty.
Check the diagnostic lights to see if
the specific problem is identified. If
the problem is not identified,
contact Dell for technical
assistance.
Power Light Hard-Drive
Light Problem Description Suggested Resolution
Light Pattern Problem Description Suggested Resolution
A possible microprocessor failure has
occurred.
Reinstall the microprocessor and restart the
computer. See your User’s Guide for
information on how to reinstall the
microprocessor for your computer.
Memory modules are detected, but a memory
failure has occurred.
1Remove and reinstall all memory modules.
Ensure that all the connector tabs are
locked. For optimal performance, install
the DIMMs in pairs (1 and 2 and 3 and 4).
2Restart the computer.
A B C D
A B C D
= yellow
= green
= off
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