Look at the side of the core that has the Airport card access door on it. If you have
an Airport card, you will need to remove it to gain access to this area. The Airport
card simply clips in and slides into it’s slot, with the antenna plugged into the end. For
instructions on how to install or remove the Airport card, refer to your Power Macintosh
G4 Cube manual.
Open the Airport access door and unscrew the two Torx T-10 screws shown here. A
magnetized screwdriver helps greatly in this situation.
Turn the Cube around to the opposite side and remove the 2 remaining screws that
secure the optical drive.