HP xw4200 Service And Technical Reference Manual page 126

Table 5-3
Solving Minor Problems (Continued)
Problem
Workstation powered off
automatically and the Power
LED flashes Red two times,
once every second, followed
by a two-second pause.
System does not power on and
the LEDs on the front of the
workstation are not flashing.
126 SYSTEM DIAGNOSTICS AND TROUBLESHOOTING
Cause
Processor thermal protection
activated:
A fan might be blocked or not
turning.
OR
The heatsink is not properly
attached to the processor.
System unable to power on.
Possible Solution
1 Ensure workstation 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, be 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.
Press and hold the power button for less than 4
seconds. If the hard drive LED turns green, then:
1 Remove the expansion cards one at a time
until the 5V_aux light on the system board
turns on.
2 Replace the system board.
OR
Press and hold the power button for less than 4
seconds. If the hard drive LED does not turn on
green then:
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 If the 5V_aux light on the system board is on,
then replace the power button harness.
5 If the 5V_aux light on the system board is off,
perform the Built-In Self-Test on the power
supply. Disconnect the AC power cord from
the system. Disconnect all internal power
supply cables. Plug in AC power.
If the green BIST LED on the rear of the
workstation is lit AND the fan is spinning,
the power supply is functional.
If the green BIST LED is not lit OR the fan is
not spinning, replace the power supply.
6 Replace the system board.