I picked up a PM 7200, and short of the brittle plastic, it mostly works. The hard drive has a varying whine, and the CD drive works. The disk drive will accept a disk and does smoothly eject, but when the machine is up and running 8.5, and I insert a disk, it locks the machine up. I can manually move the heads, and the stepper motor will move them back to zero but won't move them otherwise. Is the motor defunked? There are a couple of caps near the end, but they look fine.