Dell LATITUDE C510 - Manual (Page 74)

Check the speaker cable connections -
See the setup diagram supplied with the speakers.
Test the electrical outlet -
Ensure that the electrical outlet is working by testing it with another device, such as a lamp.
Ensure that the speakers are turned on -
See the setup diagram supplied with the speakers.
Adjust the Windows volume control -
Double-click the speaker icon in the lower-right corner of your screen. Be sure that the volume
is turned up and that the sound is not muted. Adjust the volume, bass, or treble controls to
eliminate distortion.
Test the speakers -
Plug the speaker audio cable into the line-out connector on the computer. Ensure that the
headphone volume control is turned up. Play a music CD.
Run the speaker self-test -
Some speaker systems have a self-test button on the subwoofer. See the speaker
documentation for self-test instructions.
Move the subwoofer away from the computer or monitor -
If your external speaker system includes a subwoofer, ensure that the subwoofer is at least
60 cm (2 ft) away from the computer or external monitor.
Eliminate possible interference -
Turn off nearby fans, fluorescent lights, or halogen lamps to check for interference.
Reinstall the Sound (audio) driver -
See " Reinstalling Software ."
Run the Misc. PCI Devices diagnostic test -
See " Using Dell Diagnostics ."
If the tests complete successfully, the controller is functioning properly.
If the problem persists, or if the tests do not complete successfully, contact Dell for
technical assistance.