Some people may aready have done this but I just figured it out today. I have had a stuck cd in my Mach 460 system for a couple of days now and could not get it out {slot 1}, all it would do is make a grinding noise then time out and quit.

Last night I disconected the battery and let it set overnight, reconected the battery and the system kinda recycled itself and I pushed eject and it came right. Lucky me, Hope this helps someone else.