HP Compaq dc7800 Reference Manual page 246

Table D-7 Solving Audio Problems
Sound cuts in and out.
Cause
Processor resources are being used by other open
applications.
Direct sound latency, common in many media player
applications.
Sound does not come out of the speaker or headphones.
Cause
Software volume control is turned down or muted.
Audio is hidden in Computer Setup.
The external speakers are not turned on.
The audio device may be connected to the wrong jack.
External speakers plugged into the wrong audio jack on a
recently installed sound card.
Digital CD audio is not enabled.
Headphones or devices connected to the line-out connector
mute the internal speaker.
Computer is in standby mode.
Internal speaker is disabled in Computer Setup.
234 Appendix D Troubleshooting Without Diagnostics
Solution
Shut down all open processor-intensive applications.
In Windows XP only:
1. From the Control Panel, select Sounds and Audio
Devices.
2. On the Audio tab, select a device from the Sound
Playback list.
3. Click the Advanced button and select the Performance
tab.
4. Set the Hardware acceleration slider to None and the
Sample rate conversion quality slider to Good and
retest the audio.
5. Set the Hardware acceleration slider to Full and the
Sample rate conversion quality slider to Best and
retest the audio.
Solution
Double-click the Speaker icon on the taskbar, then make sure
that Mute is not selected and use the volume slider to adjust
the volume.
Enable the audio in Computer Setup: Security >
Device Security > Audio.
Turn on the external speakers.
Ensure that the device is connected to the correct jack on the
computer. The speakers should be plugged into the rear line-
out jack and the headphones should be plugged into the front
headphone jack.
See the sound card documentation for proper speaker
connection.
Enable digital CD audio. In the Device Manager, right-click on
the CD/DVD device and select Properties. Make sure Enable
digital CD audio for this CD-ROM device is checked.
Turn on and use headphones or external speakers, if
connected, or disconnect headphones or external speakers.
Press the power button to resume from standby mode.
CAUTION: When attempting to resume from standby mode,
do not hold down the power button for more than four seconds.
Otherwise, the computer will shut down and you will lose any
unsaved data.
Enable the internal speaker in Computer Setup. Select
Advanced > Device Options > Internal Speaker.