POST Diagnostic Front Panel LEDs and
Audible Codes
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Diagnostic Front Panel LEDs and Audible Codes
Activity
Green Power
LED On.
Green Power
LED flashes
every two
seconds.
Green Power
LED flashes four
times, once per
second.
Troubleshooting Guide
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.
Beeps
Possible Cause
None
Computer on.
None
Computer in
Suspend to RAM
mode (some
models only) or
normal Suspend
mode.
None
Computer in
Suspend to Disk or
"Hibernate" mode.
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Recommended Action
None
None
None
POST Error Messages
A–11