swallmark

I had a similar problem - audio would disappear when I touched the volume or mute function on the media center DVD player and it wouldn't work on any windoes apps.

I have a M-Audio PCI sound card and the volume setting were normal and the device manager indicated everything was working fine.

I discovered that if you go to control panel | Sounds and Audi Devices | Audio Tab and click on the volume button for the default playback device, the voume was lowered to 0 - Despite tyhe fact that the volume is supposed to be controled by the M-Audio control panel.

It fixed the issue - until I try to adjust the volume again in media center. Then I have to apply the same fix