I have a 2007 macbook pro 15 inch and I am trying to burn material from iDVD onto DVD-RWs. After hours of encoding the disc, in the final write-up stage, the disc popped out explaining that it cannot finalize. Also, when I first insert it, I am told that it is not blank and asks if erasing is okay. That is also weird considering these are fresh out of the box. I have been looking at forums for the past hour and can only find firmware upgrades for powerbooks. Then I read frightening warnings about uploading the wrong firmware will destroy your computer so I am hesitant to try anything risky. Anybody wanna help a guy out! I am trying to get my portfolio to companies and I have just reached utter gridlock!!