Solving Power Supply Problems - HP Compaq dx7300 MT Reference Manual

Solving Power Supply Problems

Solving Power Supply Problems
Problem
Power supply shuts down
intermittently.
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
continue for five iterations
after which the LED flashes
will continue until the
problem is resolved.
Service Reference Guide, dx7300
Cause
Voltage selector switch
on rear of computer
chassis (some models) is
not switched to correct
line voltage (1 15V or
230V).
Power supply will not
turn on because of
internal 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.
43361 1-001
Troubleshooting Without Diagnostics
Solution
Select the proper AC voltage using
the selector switch.
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.
3. If the fan is pugged in and
seated but not spinning, replace
the processor fan.
D–5