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Table 4-1 Minor problems (continued)
Problem Cause Possible Solution
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.
Processor thermal protection is
activated.
A fan might be blocked or not
turning.
OR
The processor heatsink is not
properly attached to
the processor.
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.
System does not power on,
and the LEDs on the front of
the computer are not flashing.
System cannot power on. Press and hold the power button for less than four seconds.
If the hard drive LED turns green:
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:
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 unit (PSU) cables are
connected to the system board.
3. Verify power supply unit PSU functionality:
a. Disconnect the AC power.
b. HP Z820 Workstation only—Remove PSU. All
other workstations, unplug cables connected to
the system board.
c. Reconnect AC power
●
If the PSU fan spins and the BIST LED
illuminates, the PSU is good; replace the
system board.
●
If the PSU fan does not spin or the LED does
not illuminate, replace the PSU.
126 Chapter 4 Diagnostics and troubleshooting