Dell XPS 720 H2C (Mid 2007) - Manual (Page 65)

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