Disconnect the digital audio connector (red) and the lid switch return connector (blue) from the logic board.

Unscrew four Philips #2 screws that secure the CD-ROM drive to the chassis.

REASSEMBLY CAUTION: To prevent thread stripping during reassembly, turn screws backwards slowly until you feel the screw thread drop into the original plastic thread, and only then, tighten screw normally but lightly - you're working with 20+ year-old plastics.