Ok, so I have a macbook pro that is about 2 years old, I got it just after they released the new unibody design macbook pro's. I recently did a book and nuke because I felt my computer was running a little slowly, ever since my computer will not play dvd's. It simply does not recognise them, it keeps telling me that I inserted a blank dvd and would I like to burn something onto it. Even if I insert the dvd's that apple supplied me with when I bought the machine. Anyone have any idea how to fix this?