HP Z800 - Workstation - 6 GB RAM Maintenance And Service Manual page 206

Table 6-1 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.
194 Chapter 6 Diagnostics and troubleshooting
Cause
Processor thermal protection is
activated.
A fan might be blocked or not
turning.
OR
The processor heatsink is not
properly attached to
the processor.
System cannot power on.
Possible Solution
1. Verify 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 the fan
is not spinning, verify that the heatsink fan cable is
plugged into the system board connector and that the
heatsink is properly seated.
5. Replace the processor heatsink.
Press and hold the power button for less than four seconds.
If the hard drive LED turns green, then perform the following
steps.
OR
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.
1. Press and hold the power button for less than four
seconds. If the hard drive LED does not illuminate, then
perform the following tasks:
a. Verify that the workstation is plugged into a
working AC outlet.
b. Verify that the power button harness is connected
to the inline front panel I/O device assembly
connector.
2. Verify that the power supply cables are connected to
the system board.
3. Verify power supply functionality:
a. Disconnect the AC power.
b. Remove the power supply.
c. Reconnect the AC power.
● If the power supply fan spins and the BIST
LED illuminates (see
on page 195), 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
195), replace the power
ENWW