Yesterday I had burnt a CD for my sister, and it came out fine. However the next disk I put in didn't seem to go in right and got stuck. When I finally got it out after turning off my ibook and turning it on again, the disk came out scratched. Now whenever I try to insert another disc it can't seem to slide in at all. The mechanism appears jammed. Does anyone know what the problem is and how I can solve it? Thanks a lot