D–6 483941-001 Service Reference Guide
Troubleshooting Without Diagnostics
Interpreting Diagnostic Lights and Audible Codes
This section covers the front panel LED codes as well as the audible codes that may occur before
or during POST that do not necessarily have an error code or text message associated with them.
✎
If you see flashing LEDs on a PS/2 keyboard, look for flashing LEDs on the front panel of the
computer and refer to the following table to determine the front panel LED codes.
✎
Recommended actions in the following table are listed in the order in which they should be
performed.
✎
Replace the system board or power supply only as the last resort.
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