Power Problems - Dell Dimension U7021 Owner's Manual

Power Problems

CAUTION:
located in the Product Information Guide.
I F T H E P O W E R L I G H T I S G R E E N A N D T H E C O M P U T E R I S N O T R E S P O N D I N G
on page 53.
I F T H E P O W E R L I G H T I S B L I N K I N G G R E E N
keyboard, move the mouse, or press the power button to resume normal operation.
I F T H E P O W E R L I G H T I S O F F
• 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. Also 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
page 75).
I F T H E P O W E R L I G H T I S B L I N K I N G
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 page 75).
I F T H E P O W E R L I G H T I S S T E A D Y A M B E R
• Remove and then reinstall the memory modules (see page 76).
• Remove and then reinstall any cards (see page 79).
• Remove and then reinstall the graphics card, if applicable (see page 84).
E L I M I N A T E I N T E R F E R E N C E
• Power, keyboard, and mouse extension cables
• Too many devices on a power strip
• Multiple power strips connected to the same electrical outlet
46
Solving Problems
Before you begin any of the procedures in this section, follow the safety instructions
— The computer is either turned off or is not receiving power.
— The computer is receiving electrical power, but an internal
— A device might be malfunctioning or incorrectly installed.
— Some possible causes of interference are:
— The computer is in standby mode. Press a key on the
— See "Diagnostic Lights"