Compaq D51s Troubleshooting Guide - Page 21

Power LED flashes Red or, Flashing Red or Yellow - fan

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Troubleshooting Without Diagnostics Solving Power Supply Problems (Continued) Problem Power LED flashes Red or Yellow every 2 seconds on most models. (continued) Power supply shuts down intermittently. 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. Cause Power supply shuts down after system warms up. Thermal overload caused by bad fan. Power supply will not turn on because of internal power supply fault. Power line selector switch on rear of computer chassis not switched to correct line voltage (115V or 230V) (some models). Power supply will not turn on because of internal power supply fault. The unit temperature was exceeded. A fan may be blocked or not turning, OR the heatsink is not properly attached to the processor. Solution Replace power supply. Replace power supply. Select the proper AC voltage using the slide switch. Replace power supply. 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. Troubleshooting Guide 2-7

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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