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66 Chapter 7: Troubleshooting
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Power
Problem Possible Cause Action
No power
(The power
indicator is off)
Incorrect power voltage
• Set your computer’s power voltage
switch to your area’s power
requirements.
• Adjust the voltage settings. Ensure
that the power cord is unplugged
from the power outlet.
Your computer is not
turned on.
Press the power key on the front panel
to ensure that your computer is turned
on.
Your computer’s power
cord is not properly
connected.
• Ensure that the power cord is
properly connected.
• Use other compatible power cord.
PSU (Power supply unit)
problems
Try installing another PSU on your
computer.
Display
Problem Possible Cause Action
No display
output after
turning the
computer on
(Black screen)
The signal cable is
not connected to the
correct VGA port on your
computer.
• Connect the signal cable to the
correct display port (onboard VGA or
discrete VGA port).
• If you are using a discrete VGA
card, connect the signal cable to the
discrete VGA port.
Signal cable problems Try connecting to another monitor.