I have a Powerbook Pismo with a DVD drive that won't play DVD's. When I put a movie in the drive I can hear it spin, but it never seems to recognize the disc. I've tried opening it through DVD player, but it can't find it. It's like the machine doesn't realize there's a disc in the drive. I've checked the drive and it says it's a DVD player, and I'm running Jaguar (10.2.6 I believe). Anyone have experience with this, or have any idea as to what the problem could be?