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 computer are not flashing.
Chapter 6 Diagnostics and troubleshooting
Minor problems (continued)
Processor thermal protection is
A fan might be blocked or not
The processor heatsink is not
properly attached to
System cannot power on.
Verify that the computer air vents are not blocked.
Open the access panel and press the computer power
Verify that the system fan is running.
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.
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
To find a faulty device, remove all devices one at a
Disconnect AC power to the computer.
Remove a device.
Reconnect AC power and power on the
Repeat this process until the faulty device is identified.
Remove the graphics card last. Replace the faulty
If no faulty device is found, replace the system board.
Press and hold the power button for less than four
seconds. If the hard drive LED does not illuminate, then
perform the following tasks:
Verify that the computer is plugged into a
working AC outlet.
Verify that the power button harness is connected
to the inline front panel I/O device assembly
Verify that the power supply cables are connected to
the system board.