Table 1. Diagnostic power
LED codes
.
The following table describes the power LED light
possible causes and troubleshooting steps for the causes:
Power LED light status
Possible cause
Troubleshooting steps
Off
The computer is either turned off or is not receiving
power or in Hibernation mode.
Re-seat the power cable in the power connector on
the back of the computer and the electrical outlet.
If the computer is plugged into a power strip, ensure
that the power strip is plugged into an electrical outlet and is turned
on. Also, bypass power protection devices, power strips, and power
extension cables to verify that the computer turns on properly.
Ensure the electrical outlet is working by testing
it with another device, such as a lamp.
Steady/blinking amber
Computer fails to complete POST or processor failure.
Remove and reinstall any cards.
Remove and reinstall the graphics card, if applicable.
Ensure the power cable is connected to the system
board and processor.
Blinking white light
Computer is in sleep mode.
Press the power button to bring the computer out
of the sleep mode.
Ensure all power cables are securely connected to
the system board.
Ensure the main power cable and front panel cable
are connected to the system board.
Steady white
The computer is fully functional and in the On
state.
If the computer is not responding, do the following:
Ensure the display is connected and turned on.
If the display is connected and turned on, listen
for a beep code.
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