HP Xw8400 - Workstation - 4 GB RAM Technical Reference Manual page 120

Table 5-3 Minor problems (continued)
Problem
Poor performance is
experienced.
Workstation powered off
automatically and the Power
LED flashes Red two times,
once every second, followed
by a two-second pause, and
two simultaneous beeps are
heard.
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 is hot.
There is not enough memory.
Hard drive is full.
Processor thermal protection
activated:
A fan might be blocked or not
turning.
OR
The CPU heatsink is not properly
attached to the processor.
System unable to power on.
Possible Solution
1. Be sure airflow to the workstation is not blocked.
2. Be sure the fans are connected and working properly
(some fans only operate when needed).
3. Be sure the CPU heatsink is installed properly.
CAUTION: Disconnect AC power from the workstation
before reseating or replacing components because there is
power to the system board even when the workstation is
powered down.
Add more memory.
Transfer data from the hard drive to create more space on
the hard drive.
CAUTION: Disconnect AC power from the workstation
before reseating or replacing components because there is
power to the system board even when the workstation is
powered down.
1. Be sure workstation air vents are not blocked and the
cooling fan is running.
2. Open the hood, press the power button, and determine
if the processor fan spins. If not spinning, be sure the
fan's cable is plugged into the system board header. Be
sure the fan is fully/properly seated or installed.
3. Replace the processor fan.
4. Reseat CPU heatsink and verify that the fan assembly
is properly attached.
CAUTION: Disconnect AC power from the workstation
before reseating or replacing components because there is
power to the system board even when the workstation is
powered down.
Press and hold the power button for less than four seconds.
If the hard drive LED turns green, then:
1. Remove the expansion cards.
2. Replace the system board.
OR
Press and hold the power button for less than four seconds.
If the HDD LED does not illuminate, then:
1. Verify that the unit is plugged into a working AC outlet.
2. Open the access panel, and 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.
ENWW