I have an imac 07 silver and put a CD in the drive, one with a home made label. This CD has worked on every other PC i used but i assume the label has either come off or something in my imac, is there anything i can do to get it out, i don't want to just jam a screwdriver or anything in but i can't see any other option, the imac is trying to eject this disc every 30 seconds or so but just makes clunky noises.