HP Dc7100 Troubleshooting Guide - Page 26

Solving Power Supply Problems, Common causes and solutions for power supply problems are listed

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Troubleshooting Without Diagnostics Solving Power Supply Problems Common causes and solutions for power supply problems are listed in the following table. Solving Power Supply Problems Problem Cause Power supply shuts down intermittently. Voltage selector switch on rear of computer chassis (some models) not switched to correct line voltage (115V or 230V). Power supply will not turn on because of internal power supply fault. Computer powered off automatically and the Power LED flashes Red two times, once every second, followed by a two second pause, and the computer beeps two times. Processor thermal protection activated: A fan may be blocked or not turning. OR The heatsink is not properly attached to the processor. Solution Select the proper AC voltage using the selector switch. Contact an authorized service provider to replace the power supply. 1. Ensure that the computer air vents are not blocked and the processor cooling fan is running. 2. Open hood, press power button, and see if the processor fan spins. If the processor fan is not spinning, make sure the fan's cable is plugged onto the system board header. Ensure the fan is fully/properly seated or installed. 3. If fan is plugged in and seated properly, but is not spinning, then replace the processor fan. 4. Reseat processor heatsink and verify that the fan assembly is properly attached. 5. Contact an authorized reseller or service provider. 2-10 www.hp.com Troubleshooting Guide

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www.hp.com
Troubleshooting Guide
Troubleshooting Without Diagnostics
Solving Power Supply Problems
Common causes and solutions for power supply problems are listed in
the following table.
Solving Power Supply Problems
Problem
Cause
Solution
Power supply shuts down
intermittently.
Voltage selector switch
on rear of computer
chassis (some models)
not switched to correct
line voltage (115V or
230V).
Select the proper AC voltage using
the selector switch.
Power supply will not
turn on because of
internal power supply
fault.
Contact an authorized service
provider to replace the power
supply.
Computer powered off
automatically and the
Power LED flashes Red two
times, once every second,
followed by a two second
pause, and the computer
beeps two times.
Processor thermal
protection activated:
A fan may be blocked
or not turning.
OR
The heatsink is not
properly attached to the
processor.
1. Ensure that the computer air
vents are not blocked and the
processor cooling fan is running.
2.
Open hood, press power button,
and see if the processor fan
spins. If the processor fan is not
spinning, make sure the fan's
cable is plugged onto the system
board header. Ensure the fan is
fully/properly seated or
installed.
3. If fan is plugged in and seated
properly, but is not spinning,
then replace the processor fan.
4. Reseat processor heatsink and
verify that the fan assembly is
properly attached.
5.
Contact an authorized reseller or
service provider.