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D–4 404569-001 Service Reference Guide, dx2100 MT
Troubleshooting Without Diagnostics
Solving Power Supply Problems
Solving Power Supply Problems
Problem Cause Solution
Power supply shuts down
intermittently.
Voltage selector switch
on rear of computer
chassis not switched to
correct line voltage.
Select the proper AC voltage.
Power supply fault. Replace the power supply.
Computer powered off
automatically and the
Power LED glows for 4
seconds followed by a one
second pause.
Processor thermal
protection activated:
A fan may be blocked
or not turning.
OR
The heatsink/fan
assembly is not properly
attached to the
processor.
1. Ensure that the computer air
vents are not blocked and the
cooling fan is running.
2. Open hood, press the power
button, and see if the processor
fan spins. If the processor fan is
not spinning, make sure the
fan's cable is plugged onto the
system board header. Ensure
the fan is fully/properly seated
or installed.
3. Replace the processor fan.
4. Reseat processor heatsink and
verify that the fan assembly is
properly attached.