Dell Precision 650 - Manual (Page 147)

No sound from headphones
System Board Problems
Fill out the Diagnostics Checklist as you complete the following checks.
Ensure that the subwoofer and the speakers are turned on — See the setup diagram supplied with the speakers. If your speakers have
volume controls, adjust the volume, bass, or treble to eliminate distortion.
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.
Test the electrical outlet — Ensure that the electrical outlet is working by testing it with another device, such as a lamp.
Eliminate possible interference — Turn off nearby fans, fluorescent lights, or halogen lamps to check for interference.
Run the speaker diagnostics — Some speaker systems have self- diagnostics. See the speaker documentation for diagnostics instructions.
Reinstall the audio (sound) driver — See " Reinstalling Drivers ."
Check the device option setting — Enter system setup and ensure that Sound under the Integrated Devices option is set to On. Exit
system setup and restart the computer.
Run the Dell Diagnostics —
l If the tests complete successfully, the controller is functioning properly.
l If the problem persists, or if the tests do not complete successfully, contact Dell .
Check for interrupt request conflicts — See Resolving Software and Hardware Incompatibilities .
Check the headphone cable connection — Ensure that the headphone cable is securely inserted into the headphone connector.
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.
Disable digital mode — Your headphones do not work if the CD drive is operating in digital mode. To disable digital mode:
1. Click the Start button, click Control Panel, and then click Sounds, Speech, and Audio Devices.
2. Click Sounds and Audio Devices.
3. Click the Hardware tab.
4. Double-click the name of your CD drive.
5. Click the Properties tab.
6. Uncheck the Enable digital CD audio for this CD-ROM device box.
Run the Dell Diagnostics — Restart the computer and run t the Dell Diagnostics . If any of the tests fail, contact Dell .
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the System Information Guide.
Check the power supply cable connections —
1. Turn off the computer and devices, disconnect them from electrical outlets, wait 10 to 20 seconds, and then open the computer cover.
2. Ensure that the power cables from the power supply are firmly connected to the connectors on the system board.
3. Close the computer cover, reconnect the computer and devices to electrical outlets, and turn them on.
Perform all checks in " Card Problems "
Perform all checks in " Keyboard Problems "
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the System Information Guide.
Reinstall the battery —
1. Turn off the computer and devices, disconnect them from electrical outlets, wait 10 to 20 seconds, and then open the computer.
2. Remove the battery, wait 5 minutes, and reinstall the battery.
3. Close the computer cover, reconnect the computer and devices to electrical outlets, and turn them on.
If the problem still exists, contact Dell .
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the System Information Guide.