Here's one more thing to try first:
a. Turn the machine OFF.
b. Move the computer so that the optical drive is pointing DOWN over the edge of a table. Make SURE you are holding it properly so you don't drop the computer.
c. Turn the computer on and hold the mouse key down (the normal way to eject a disk at startup ... unless the motor is totally dead, it WILL try to eject). Let gravity do the rest.
We've had a number of reports of success with this method here. No guarantees, but if that doesn't work you'll know you've tried everything prior to disassembling the drive.
Okay guys...
I rebuilt the drive and reinstalled and the same problem - therfore the drive is screwed. Thanks chscag for the link to the Fixit guides!!!!
Now that I am confident I can replace the optical drive - where do I start to look for a replacement drive?