For a while now, I haven't been able to insert any disc into my 12 inch Rev. A powerbook. It's as if something is obstructing the disc and I can't insert it (almost as if there's already a disc inside). However if I try to eject notihng happens, and the computer doesn't inform me if there's a disc inside (honestly I don't know, I dont think there's anything in there). Has anyone heard of this or have a solution? I don't have applecare for it.