Dell T7400 manual Power Problems, Diagnostic Lights on

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

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Quick Reference Guide