Clear CMOS
Open the computer case and look for the CMOS battery.
Make sure you are grounded before touching any internal components. Static electricity can fry the motherboard!
While you are in there, I would also, blow out the dust with a can of compressed air and make sure that the CD drive's data cable is plugged in properly, and the jumper is in the right position.
Have you tried more that one optical drive? Did you use the same data cable?