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Troubleshooting Guide 2–7
Troubleshooting Without Diagnostics
Power LED flashes Red or
Yellow every 2 seconds on
most models.
(continued)
Power supply shuts
down after system
warms up. Thermal
overload caused by
bad fan.
Replace power supply.
Power supply will not
turn on because of
internal power supply
fault.
Replace power supply.
Power supply shuts down
intermittently.
Power line selector
switch on rear of
computer chassis not
switched to correct line
voltage (115V or 230V)
(some models).
Select the proper AC voltage using
the slide switch.
Power supply will not
turn on because of
internal power supply
fault.
Replace power supply.
Computer powered off
automatically and the
Power LED is:
1. Flashing Red or Yellow
four times per second,
OR
2. Flashing Red two
times one second
apart, followed by a
two second pause,
OR
3. Not flashing.
The unit temperature
was exceeded. A fan
may be blocked or
not turning, OR the
heatsink is not properly
attached to the
processor.
1. Unit is in an exceedingly hot
environment. Let it cool down.
2. Ensure computer air vents are
not blocked and internal fans
are running (such as, the
power supply fan, chassis fan,
and/or the processor fan).
3. Ensure heatsink is properly
seated.
4. Contact Compaq authorized
reseller or service provider.
Solving Power Supply Problems
(Continued)
Problem Cause Solution
177620-006.book Page 7 Thursday, March 14, 2002 3:16 PM