Advanced Troubleshooting 221
Diagnostic Lights
To help you troubleshoot a problem, your computer is equipped with four lights on the
front panel labeled "A," "B," "C," and "D". These lights can be yellow or green. When the
computer starts normally, the lights flash. After the computer starts, the lights remain
green. If the computer malfunctions, the color and sequence of the lights identify the
problem.
CAUTION: Before you begin any of the procedures in this section, follow the
safety instructions in the
System Information Guide
.
Diagnostic Light Codes Before POST
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."
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
No electrical power is supplied to
the computer.
Connect the computer to its electrical outlet. Ensure
that the front-panel power light is on. If the power light
is off, ensure that the computer is connected to a
working electrical outlet and then press the power
button.
If the problem is still not resolved, contact Dell for
technical assistance.
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