okay, first disconnect everything from the outside, and put it on a flat clear surface
open the side access door
just beside the CD drive at the front is a small plastic tab that when you pulll on it gently, it releases the front bezel. There are two such tabs, another one being just below, beside where the zip drive would be if you had one. The bezel should open out like a door, and then come off easily
You have now revealed two screws at the front that hold in the CD-drive/zip drive chassis. Undo these screws and pulll the chassis forward an inch
This should give you enough room inside to get your fingers in and remove the data and power cables from the back of the CD drive, and the zip drive, if you have one. The power cable can be one tough son of a bitch to pull out, you might try easing it out with a flat head screwdriver, or needle nose pliers
once everything is unhooked, slide out the whole chassis.
You now have the part you want out. Discard the rest of the computer.
Remove the four screws that attach the CD-drive to the chassis, and slide the CD drive out of the chassis.
fix the CD-drive