HP Compaq dx7300 MT Reference Manual page 188

Troubleshooting Without Diagnostics
Solving Minor Problems (Continued)
Problem
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.
System does not power
on and the LEDs on the
front of the computer
are not flashing.
D–4
Cause
Processor thermal
protection activated:
A fan may be blocked or
not turning.
OR
The heatsink is not
properly attached to the
processor.
System unable to power
on.
43361 1-001
Possible Solution
1. Ensure computer air vents are not
blocked and the cooling fan is
running.
2. Open hood, press power button,
and see if the processor fan
spins. If not spinning, make sure
the fan's cable is plugged onto
the system board header.
3. Replace the processor
heatsink-fan assembly.
Press and hold the power button for
less than 4 seconds. If the hard drive
LED turns green, then:
1. Check that the voltage selector,
located on the rear of the power
supply on some models, is set to
the appropriate voltage. Proper
voltage setting depends on your
region.
2. Remove the expansion cards one
at a time until the 5V_aux light on
the system board turns on.
3. Replace the system board.
OR
Press and hold the power button for
less than 4 seconds. The hard drive
LED does not turn on green.
1. Check that the unit is plugged
into a working AC outlet.
2. Open hood and check that the
power button harness is properly
connected to the system board.
3. Check that both power supply
cables are properly connected to
the system board.
4. Check to see if the 5V_aux light
on the system board is turned on.
If it is turned on, then replace the
power button harness.
5. If the 5V_aux light on the system
board is off, then replace the
power supply.
6. Replace the system board.
Service Reference Guide, dx7300