Superdrive: Cd reader and Burner works but DVD's won't read

Hey, anyone have any ideas?
My CD burner and player work great, I burn off of it all the time. However if I try to insert a DVD it makes noises, like it's trying to read but spits it back out. I tried resenting it but nothing is working.
Anyone have any clue why one would work and the other wouldn't I thought they were one in the same?
Thanks ANYTHING would be helpful

I am having the same issue and it does notappear to be a software issues unless it is a firmware one....
normal CDs enter the drive and mount just fine yet DVDs do not. The Dvds that I insert into the drive will not mount and the drive kicks them out a few seconds after I put them in. NOw this seems to only occor for movie DvDs, DvDs that have minor scratching, but are still readable in my MDD G4 desktop and certain commercial game disks.
Only 2 possibilities come to mind: 1, a firmware issue yet it is fully upgraded; 2, a physical issue with the drive and movie DvDs being a slightly different physically then other ones (this is not likely but it is the only thing I can come up with.
The discussion linked above does not pretain to this issue. as this is a more select issue that seems to be more hardware related than simple prefrences related.

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