Dell Precision M6400 Service Manual - Page 13

Troubleshooting: Dell Precision M6400 Service Manual No sound from speakers NOTE: The volume control in MP3 and other media players may override the Windows volume setting. Always check to ensure that the volume on the media player(s) has not been turned down or off. Adjust the Windows volume control - 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. Disconnect headphones from the headphone connector - Sound from the speakers is automatically disabled when headphones are connected to the computer's front-panel headphone connector. Eliminate possible interference - Turn off nearby fans, fluorescent lights, or halogen lamps to check for interference. Run the Hardware Troubleshooter - See Hardware Troubleshooter. No sound from headphones Check the headphone cable connection - Ensure that the headphone cable is securely inserted into the headphone connector. See the Setup and Quick Reference Guide for your computer at support.dell.com. Adjust the Windows volume control - 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 Display Problems CAUTION: Before working inside your computer, read the safety information that shipped with your computer. For additional safety best practices information, see the Regulatory Compliance Homepage on www.dell.com at: www.dell.com/regulatory_compliance. NOTICE: If your computer came with a PCI 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. Check the diagnostic lights - See Diagnostic Lights. Check the display settings - See the Dell™ Technology Guide at support.dell.com. Adjust the Windows display settings - Windows XP: 1. Click Start® Control Panel® Appearance and Themes. 2. Click the area you want to change or click the Display icon. 3. Try different settings for Color quality and Screen resolution. Windows Vista: 1. Click Start ® Control Panel® Hardware and Sound® Personalization® Display Settings. 2. Adjust Resolution and Colors settings, as needed. Only part of the display is readable file:///T|/htdocs/systems/wsm6400/en/sm/trouble.htm[11/16/2012 10:26:15 AM]