Dell Dimension C521 Owner's Manual - Page 44

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 E I N S T A L L T H E S O U N D D R I V E R - See "Reinstalling Drivers" on page 53. 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 "Resolving Software and Hardware Incompatibilities" on page 54. 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 "Front View of the Computer" on page 13). 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. E N S U R E T H A T T H E C O R R E C T A U D I O S O L U T I O N I S E N A B L E D I N T H E B I O S S E T U P P R O G R A M - See "System Setup" on page 97. Video and Monitor Problems CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide. NOTE: See the monitor documentation for troubleshooting procedures. The screen is blank CHECK THE MONITOR CABLE CONNECTION - • Ensure that the graphics cable is connected as shown on the setup diagram for your computer. If an optional video card is installed, check that the monitor cable is connected to the card, rather than the video connector on the system board. • If you are using a graphics extension cable and removing the cable solves the problem, the cable is defective. • Swap the computer and monitor power cables to determine if the power cable is defective. • Check the connector for bent or broken pins. It is normal for monitor cable connectors to have missing pins. 44 Solving Problems