Thank you for replying.
Everything works normally, except DVD audio.
Sound is present in Windows, CD playback, games, etc. When trying to play a DVD I get picture and no sound.
I have removed the other SATA hard drive to no avail. The only reason I mentioned it was just to indicate I was rooting around in the system, but thinking about it now i realize there are no audio plugs or cords etc that I might have left undone.
I only have 1 DVD drive in the system which is playing CD's properly and video from DVD's but no sound.
All of this worked literally hours ago.