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Troubleshooting 75
Power Lights
CAUTION: Before you begin any of the procedures in this section, follow the
safety instructions in the Product Information Guide.
The power button light located on the front of the computer illuminates and
blinks or remains solid to indicate different states:
• If the power light is blue and the computer is not responding, see
"Diagnostic Lights" on page 76.
• If the power light is blinking blue, the computer is in standby mode. Press
a key on the keyboard, move the mouse, or press the power button to
resume normal operation.
• If the power light is off, the computer is either turned off or is not
receiving power.
– Reseat the power cable into both 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 that the power strip is
turned on.
– Bypass power protection devices, power strips, and power extension
cables to verify that the computer turns on properly.
– Ensure that the electrical outlet is working by testing it with another
device, such as a lamp.
– Ensure that the main power cable and front panel cable are securely
connected to the system board (see "System Board Components" on
page 103).
• If the power light is blinking amber, the computer is receiving electrical
power, but an internal power problem might exist.
– Ensure that the voltage selection switch is set to match the AC power
at your location, if applicable.
– Ensure that the processor power cable is securely connected to the
system board (see "System Board Components" on page 103).
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