Imac 21.5" can read CD but cant read DVD

Hello everybody,
I have an imac 21.5", i bought this imac in july of 2010. Previously the superdrive works perfectly but now the superdrive can't read dvd.
the strangle is that the superdrive can read cd's but no dvds.
some suggestion?

I'm having this problem too. Intel iMac 21.5in  can read audio cds, but attempts at trying to read several different type of DVDs are failing to load. Spits the dvd out after trying for a minute or two.  I've hardly ever tried doing anything with DVDs since getting this computer, so  I can't speculate as to when the problem started. 
Are there any known solutions to this problem ?  If I had an Apple store closer than 200 miles I'd take it there.

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