Hey,
Looks like you have the same problem i do. The cd drives in these machines seem to go out after so many hours of use. Mine went out about a 1.5 years ago. Ive seen many people talk about it happening on these message boards. I tried to order an OEM drive from Otherworld computing and had no luck getting it to work so i wouldnt try that. But if you do find another drive that does work let me know.
Good luck,
Greg Palmer