Suddenly My Superdrive has stopped reading DVDs (burned-blank-movie).
I have an Imac G4, ive had it since 2003 and since last December ive been having problems with it.. either it wouldn't read some of the DVDs I burned with Toast or using the Finder. Now it just spits every DVD i put in it!! It's driving me crazy!!

Is this a Firmware problems?? Is this a problem with the lens??
Or is there any manual on how to replace the drive on the Imac?? and is there any DVD-r models out there in the market compatible with the Imac G4....

Pleas help!! thanks