Dvd drive not recognizing dvds but recognizes all other disks

My dvd drive on my macbook will recognize cds both burned and retail. It will recognize mac formated (burned) dvds. But it will not recognize any other dvds. It burns in a non mac format (ie burning a linux ISO image). I was just watching a movie on here the other day with no problems.
anyone have any thoughts?

[Edit to above Post]
the DVD drive itself wasn't dead. It was a software based issue. Whether it was an OS issue or a installed software issue is undeterminted. I did a full backup and then reinstalled Mac OSX Lion and the issue was fixed. I do not know what software I installed unfortunetly.
Hope this helps other people.

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