128 Troubleshooting
RUN THE HARDWARE TROUBLESHOOTER—See "Troubleshooting Software and
Hardware Problems" on page145.
Power Problems. CAUTION: Before you begin any of the procedures in this section, follow the
safety instructions in the Product Information Guide.
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 in the power connector on the back of the computer and the
electrical outlet.
• Bypass power strips, power extension cables, and other power protection devices to
verify that the computer turns on properly.
• Ensure that any power strips being used are plugged into an electrical outlet and are
turned on.
• Ensure that the electrical outlet is working by testing it with another device, such as a
lamp.).
IF THE POWER LIGHT IS BLINKING AMBER —The computer is receiving electrical
power, but an internal power problem may exist.
• Ensure that the voltage selection switch is set to match the AC power at your location
(if applicable).
Ensure that all components and cables are properly installed and securely connected to
the system board (see "System Board" on page212).
IF THE POWER LIGHT IS STEADY AMBER —A device may be malfunctioning or
incorrectly installed.
• Ensure that the processor power cable is securely connected to the system board
power connector (POWER2) (see "System Board" on page212).
• Remove and then reinstall all memory modules (see "Memory" on page 161).
• Remove and then reinstall any expansion cards, including graphics cards (see
"Removing an ExpressCard or Blank" on page101).
ELIMINATE INTERFERENCE —Some possible causes of interference are:
• Power, keyboard, and mouse extension cables
• Too many devices connected to the same power strip
• Multiple power strips connected to the same electrical outlet
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