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Troubleshooting Guide A–17
Post Error Messages
Yellow or Green
Power LED
flashes every
second (on select
models.)
None System memory error. 1. Check memory module
(see the relevant section
of the
Hardware
Reference Guide
).
2. Remove and reseat
memory module.
3. See the “Solving Memory
Problems” section of this
guide.
Red or Yellow
Power LED On
None Processor unseated. Reseat processor in system
board.
Red or Yellow
Power LED is:
1. Flashing four
times per
second, Or
2. Flashing two
times one
second apart,
followed by a
two second
pause, Or
3. Not flashing.
None Computer overheated. 1. Install computer cover
or access panel if
necessary.
2. Ensure that computer air
vents are not blocked and
internal fan is running.
Diagnostic Keyboard LEDS, Front Panel LEDs and Audible Codes
Activity Beeps Probable Cause Recommended Action
177620-006.book Page 17 Thursday, March 14, 2002 3:16 PM