HP Xw6600 - Workstation - 2 GB RAM Technical Reference Manual page 120

Table 5-2 Minor problems (continued)
Problem
Workstation powered off
automatically and the Power
LED flashes red 2 times (once
every second), followed by a 2-
second pause, and then two
simultaneous beeps sounded.
System does not power on,
and the LEDs on the front of
the workstation are not
flashing.
110 Chapter 5 System diagnostics and troubleshooting
Cause
Processor thermal protection
activated.
A fan might be blocked or not
turning.
OR
The processor heatsink is not
properly attached to
the processor.
System is unable to power on.
Possible Solution
1. Ensure that the workstation air vents are not blocked.
2. Open the access panel and press the workstation
power button.
3. Verify that the system fan is running.
4. Verify that the processor heatsink fan spins. If it is not
spinning, ensure that the heatsink fan cable is plugged
into the system board connector. Ensure that the
heatsink is properly seated.
5. Replace the processor heatsink.
Press and hold the power button for less than 4 seconds. If
the hard drive LED turns green, then:
1. To find a faulty device, remove all devices one at a time:
a. Disconnect AC power to the workstation.
b. Remove a device.
c. Reconnect AC power and power-on the
workstation.
2. Repeat this process until the faulty device is identified.
(Remove the graphics card last.) Replace the faulty
device.
3. If no faulty device is found, replace the system board.
OR
Press and hold the power button for less than 4 seconds. If
the hard drive LED does not illuminate, then:
Press and hold the power button for less than 4 seconds. If
the hard drive LED does not illuminate, then:
1. Verify that the workstation is plugged into a working AC
outlet.
2. Verify that the power button harness is properly
connected to the inline front panel I/O device assembly
connector.
3. Verify that the power supply cables are properly
connected to the system board.
4. Verify power supply functionality:
a. Disconnect AC power.
b. Remove all internal power supply cables from the
system board.
c. Plug in AC power.
●
If the power supply fan spins and the BIST
LED illuminates (see
on page 111), then the power supply is
good. Replace the system board.
●
If the power supply fan does not spin or the
LED does not illuminate (see
supply on page
supply.
Testing power supply
Testing power
111), replace the power
ENWW