HP Z1 Maintenance And Service Manual page 72

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Table 4-1
Problem
Workstation powered off
automatically and the Power
LED flashes red two times
(once per second), followed
by a two second pause, and
then two consecutive beeps.
System does not power on,
and the LEDs on the side of
the computer are not
flashing.
64
Chapter 4 Diagnostics and troubleshooting
Minor problems (continued)
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 computer air vents are not blocked.
2.
Open the access panel and press the computer 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.
1.
To find a faulty device, remove all devices one at a
time:
a.
Disconnect AC power to the computer.
b.
Remove a device.
c.
Reconnect AC power and power on the
computer.
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
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 computer 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.

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