Dell Precision T7400 DCDO, Quick Reference Manual

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46
Quick Reference Guide
Power Problems
CAUTION:
Before you begin any of the procedures in this section, follow the
safety instructions 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
— See
"Diagnostic Lights" on page 26.
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
— The computer is in standby mode.
Press a key on the 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
—
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.
• Ensure that the main power cable and front panel cable are securely connected to the
system board (see "System Board Components" in your User’s Guide ).
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 A M B E R
—
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 Components" in your User’s Guide ).
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
—
A device may be malfunctioning or
incorrectly installed.
• Remove and then reinstall all memory modules (see "Removing the Front Panel" in
your User’s Guide ).
• Remove and then reinstall any expansion cards, including graphics cards (see "Cards"
in your User’s Guide ).
E
L I M I N A T E I N T E R F E R E N C E
—
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