When my 17" book was new, it sometimes had trouble ejecting discs. This may sound strange but I remedied the problem by inserting the corner of a piece of paper in middle of the slot an inch or so, as I hit the eject button. The disc would come right out. (After a while, this was no longer necessary.) Seems the discs were getting caught on the lip of the slot or something. I doubt this is your problem but it's worth a try.