DVD Playback - No Sound
I'm encountering problems playing back DVDs on my laptop in both my Windows XP and Linux (Ubuntu 8.04 Beta) installs. In Linux, it simply will not read the disc (I have the codecs). In Windows, it plays the DVD video part, but without audio. It plays back most other media formats fine (all the ones I've tried). I tried uninstalling and reinstalling the IDE channel the player is on and made sure it was set on DMA mode. Right now, it says "Multi-Word DMA Mode 2" which seems odd, but it repeatedly enters that mode. It's sort of annoying. Any advice?
Tried VLC, Windows Media Player 11, and some proprietary software that came on a few discs. It's not just one disc either - as far as I can tell, it's all of them.
EDIT: Added Windows version.