I inserted a CD-RW that was given to me by a PC user, and now I can't get it out of my PowerBook. When I put it in, the cd drive will start and stop spinning incessantly for about 5 minutes. When I tried to eject the disc, the cd icon disappeared from my desktop, but the disc did not actually come out. When I try to view the disc from a Finder window, it tells me that it does not exist. I then rebooted my machine, and tried to remove it from the Disk Utility, but nothing worked there either. Is there any way to physically force the disc to eject?