Screwy audio

One day I’m playing DVD’s fine, the next day I’m getting the sound track but no, or muffled speech. Like I lost a channel. It plays CD’s fine and any other stored audio I have on file. Just DVD’s. Start looking for a disconnected wire?

At the same time I started getting

Net Service Configuration
The specified service does not exist as an installed service

Maybe unrelated, but thought I’d mention it. I have 2 drives, a LG and a Optiarc. They are about 2 months old. I’ve played with the audio settings even though I’m getting sound from both channels with CD’s.

Any ideas??