> One thing to watch for are the little 20-way Apple ribbon cables that > link these drives to the mainboard. They are not what they seem -- in > particlar 1 ro 2 wries are not wires at all, but solid plastic, so those > pins of the connectors are not linked. If they are, then all sorts of odd > things happen (Eject motor runs continuously???) > > I beelive there are at least 2 versions of the calbe (for double sided > and high density drives>?, with different coloured pin 1 tracers. A Mac > enthusiast may know more. >

I don't remember all the details. I do remember that there is a cable with a yellow stripe on pin 1 and another version of the cable with a red stripe. If you install the wrong cable (can't remember whether it's red for yellow or yellow for red) the eject motor does indeed run continuously. It doesn't seem to damage the drive; I never let it run more than a few seconds. So it's easy enough to identify and correct.