Troubleshooting Guide

2–10 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. (Beeps
stop after fifth iteration but
LEDs continue flashing.)
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.