Troubleshooting
CAUTION: To guard against the likelihood of electric shock, laceration by moving fan blades, or other expected injuries, always unplug your computer from the electrical outlet before opening the cover.
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions that shipped with your computer.
Troubleshooting Tools
Power Light
CAUTION: Before you begin any of the procedures in this section, read and follow the safety instructions provided with your computer.
The power light located on the front of the computer illuminates and remains solid or blinks to indicate different states:
•If the power light is green and the computer is not responding, see "Diagnostic Lights" in your Service Manual.
•If the power light is blinking green, 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.
Troubleshooting
29