DVD No Longer Recognized

I have a production DVD which my desktop Mac recognized just fine the other day. Today, it spins for about a minute before being spit back out unrecognized. It IS recognized in my PowerBook and standalone DVD players, and all other DVDs and CDs are recognized just fine by my desktop system, so the drive is not the problem nor is the disk. That leaves a system config which I cannot (and don't have the time to) figure out. Can anyone shed any light? The only clue I can think of is that the disk was ejected using the keyboard button while the computer was in the Login Window.
Thanks,
Lou

Did you update your QuickTime to 7.0.4. Thanks to William Gray1 in another thread for posting this link to MacFixit.com:
http://www.macfixit.com/article.php?story=20060113114519669
Maybe that will help.

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