Solving Power Supply Problems - HP dx2100 - Microtower PC Service & Reference Manual

Troubleshooting Without Diagnostics

Solving Power Supply Problems

Solving Power Supply Problems
Problem
Power supply shuts down
intermittently.
Computer powered off
automatically and the
Power LED glows for 4
seconds followed by a one
second pause.
D–4
Cause
Voltage selector switch
on rear of computer
chassis not switched to
correct line voltage.
Power supply fault.
Processor thermal
protection activated:
A fan may be blocked
or not turning.
OR
The heatsink/fan
assembly is not properly
attached to the
processor.
404569-001
Solution
Select the proper AC voltage.
Replace the power supply.
1. Ensure that the computer air
vents are not blocked and the
cooling fan is running.
2. Open hood, press the 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. Replace the processor fan.
4. Reseat processor heatsink and
verify that the fan assembly is
properly attached.
Service Reference Guide, dx2100 MT