no sound playing DVD

[stan]

I just upgraded a machine to 9.10, and used this link:

http://www.johannes-eva.net/index.php?page=2009_10_useful_ubuntu_guide_karmic

To set up to play DVD's. (actually I did this on a desktop, and a laptop). 
On the desktop, all seems well, ecept that I don;t have any sound while
playing DVD's. I do have sound playing MP4's with mp3blaster, if that helps
to diagnose the issue.

What should I chekc to diagnose/repair this?

The laptop is another problem, it plays some DVD's, but won't play
comercialy issued ones, any sugestions here?

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