Dell OptiPlex GX280 - Manual (Page 155)

No sound from headphones
Check the headphone cable connection — Ensure that the headphone cable is securely inserted into the
headphone connector.
Disable digital mode — Your headphones do not work if the CD drive is operating in digital mode.
Windows XP
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.
Windows 2000
1. Click the Start button, point to Settings® Control Panel, and then click Sounds and Multimedia.
2. Click the Hardware tab.
3. Click the name of your CD drive and click Properties.
4. Click the Properties tab.
5. Uncheck the Enable digital CD audio for this CD-ROM device box.
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 Monitor Problems
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 located in
the Product Information Guide.
If the screen is blank
NOTE: See the monitor documentation for troubleshooting procedures.
Check the monitor cable connection —
If you purchased a graphics card, ensure that the monitor is connected to the card.
Ensure that your monitor is properly connected (see the Quick Reference Guide that came with your
computer).
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.)
Check the monitor power light — If the power light is off, firmly press the button to ensure that the
monitor is turned on. If the power light is lit or blinking, the monitor has power. If the power light is blinking,
press a key on the keyboard or move the mouse.
Test the electrical outlet — Ensure that the electrical outlet is working by testing it with another device,
such as a lamp.