I have a pm 7600 in which the internal cd drive (12x from apple) died. I have an old 6100 that has a cd drive in it (an apple 2x drive I think). When I tried to swap in the old 2x drive my 7600 wouldn't boot, it would just hang on bootup. It didn't even make it to the smiley mac. I checked the scsi ID, and there should be no conflicts. How can I make this older drive work in my 7600?