No Sound From Speakers; No Sound From Headphones; Video And Monitor Problems - Dell Precision 490 Desktop User Manual

Fill out the Diagnostics Checklist as you complete these checks.
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.

No sound from speakers

NOTE: The volume control in some MP3 players overrides the Windows volume setting. If you have been listening to MP3 songs, ensure that you did not
turn the player volume down or off.
Check the speaker cable connections —
speakers. If you purchased a sound card, ensure that the speakers are connected to the card.
Ensure that the subwoofer and the speakers are turned on —
volume controls, adjust the volume, bass, or treble to eliminate distortion.
Adjust the Windows volume control —
volume is turned up and that the sound is not muted.
Disconnect headphones from the headphone connector —
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.
Enable digital mode — Your speakers do not work if the CD drive is operating in analog 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. Check the Enable digital CD audio for this CD-ROM device box.
Eliminate possible interference —
Run the speaker diagnostics
Reinstall the audio driver — See
Check the device option setting —
set to On (if using the integrated audio solution) or Off (if using an expansion card solution). Exit system setup and restart your computer.
Run the Dell Diagnostics — See
Check for Software and Hardware Conflicts —

No sound from headphones

Check the headphone cable connection —
Your Computer.
Adjust the Windows volume control —
volume is turned up and that the sound is not muted.
Video and Monitor Problems
Ensure that the speakers are connected as shown on the setup diagram supplied with the
See the setup diagram supplied with the speakers. If your speakers have
Click or double-click the speaker icon in the lower-right corner of your screen. Ensure that the
Sound from the speakers is automatically disabled when headphones are
Turn off nearby fans, fluorescent lights, or halogen lamps to check for interference.
Reinstalling Drivers and Utilities.
Enter System Setup (see System
Dell Diagnostics.
See Software and Hardware
Ensure that the headphone cable is securely inserted into the headphone connector. See
Click or double-click the speaker icon in the lower-right corner of your screen. Ensure that the
Setup) and ensure that Sound under the Integrated Devices option is
Incompatibilities.
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