Dell T7400 manual Video and Monitor Problems, N T H E S P E a K E R D I a G N O S T I C S

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.

E L I M I N A T E P O S S I B L E I N T E R F E R E N C E — Turn off nearby fans, fluorescent lights, or halogen lamps to check for interference.

R U N T H E S P E A K E R D I A G N O S T I C S

R E I N S T A L L T H E S O U N D D R I V E R — See "Drivers" in your User’s Guide.

R U N T H E H A R D W A R E TR O U B L E S H O O T E R — See "Restoring Your Operating System"

in your User’s Guide.

No sound from headphones

C H E C K T H E H E A D P H O N E C A B L E C O N N E C T I O N — Ensure that the headphone cable is securely inserted into the headphone connector (see "About Your Computer" in your User’s Guide).

A D J U S T T H E W I N D O W S V O L U M E C O N T R O L — Click or double-click the speaker icon in the lower-right corner of your screen. Ensure that the volume is turned up and that the sound is not muted.

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.

Quick Reference Guide

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