Dell XPS 720, Owner'S Manual

Page: 65 / 220

Troubleshooting
65
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 green and the computer is not responding, see "Diagnostic Lights" on page 66.
• 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.
– Ensure that the main power cable and front panel cable are securely connected to the system
board (see "System Board Components" on page 89).
• 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 89).
• If the power light is steady amber, a device may be malfunctioning or incorrectly installed.
– Remove and then reinstall the memory modules (see "Memory" on page 90).
– Remove and then reinstall any cards (see "Cards" on page 94).
• Eliminate interference. Some possible causes of interference are:
– Power, keyboard, and mouse extension cables
– Too many devices on a power strip
– Multiple power strips connected to the same electrical outlet