A friend of mine asked me to help him understand why he had no audio on his Windows XP PC. Initial investigation revealed that the audio input to his speakers was plugged into the built in green audio port on the motherboard, while somebody had installed Soundblaster card at one time. Moving the audio input plug into the Soundblaster resolved ALL the audio issues BUT one.
Everything plays EXCEPT for the audio on his multimedia DVDs. At first he was using the Interactual DVD player and was getting no audio. I re-routed his default DVD player to Windows Media Player 9, which also played the DVD with no audio. We tried a couple of other DVDs which we know DO HAVE working audio, but to no avail.
Everything looks kosher in Device Manager, and not audio inputs or outputs are muted in the Windows Audio controls, so I'm kind of wondering what else to look at if the DVD audio just refuses to work. BTW, the DVD VIdeo works just fine, so...???