I just finished making a small movie in imovie, then tried burning the movie in idvd, and it asks me to insert a recordable dvd-r, which i do, but for some reason it doesnt recognize the dvd, and spits it back out, and keeps asking me to insert a recrodable dvd. I know this is the right kind of dvd, I even brought the movie into toast, and burnt that. Do yo uhave any idea why I can't just burn the movie from idvd? or why its not recognizing the dvd?