Dell T7400 manual Video and Monitor Problems, Screen is blank

Video and Monitor Problems

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.

NOTICE: If your computer came with a PCI Express graphics card installed, removal of the card is not necessary when installing additional graphics cards; however, the card is required for troubleshooting purposes. If you remove the card, store it in a safe and secure location. For information about your graphics card, go to support.dell.com.

The screen is blank

NOTE: For troubleshooting procedures, see the monitor documentation.

C H E C K T H E M O N I T O R C A B L E C O N N E C T I O N —

•Ensure that the monitor cable is connected to the correct graphics card (for dual graphics card configurations).

•If you are using a DVI-to-VGA adapter, ensure that the adapter is correctly attached to the graphics card and monitor.

•Ensure that the monitor cable is connected as shown on the setup diagram for your computer.

•Remove any video extension cables and connect the monitor directly to the computer.

•Swap the computer and monitor power cables to determine if the monitor’s power cable is defective.

•Check the connectors for bent or broken pins (it is normal for monitor cable connectors to have missing pins).

C H E C K T H E M O N I T O R P O W E R L I G H T —

•If the power light is lit or blinking, the monitor has power.

•If the power light is off, firmly press the button to ensure that the monitor is turned on.

•If the power light is blinking, press a key on the keyboard or move the mouse to resume normal operation.

TE S T T H E E L E C T R I C A L O U T L E T — Ensure that the electrical outlet is working by testing it with another device, such as a lamp.

C H E C K T H E D I A G N O S T I C L I G H T S — See "Diagnostic Lights" on page 26.

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