I had a similar problem, and solved it by doing a manual re-install the of the DVD-CD Driver--my situation was even worse than yours because my drive didn't even want to read the CD I'd created with the OS installers, so I ended up e-mailing myself the driver--my recollection is that I was running OS 9 and I ended up getting the driver from OS 8.5--I went to MacFixit, and found that many people were having the same problem--my solution is posted there,probably with more detail on the fix than I remember right now--