7.To remove the bottom case you will need to disengage it at the left and right sides, then carefully pivot it forward to release a retaining clip near the DVD drive slot, as follows.
Important: Do not push on the rubber feet of the bottom case.
At the left side, carefully slide the bottom case slightly up and away from you by pushing on it just above the hinge of the display, and at the same time from within the battery compartment, pushing away from you on the edge of the bottom case, until the left side releases.
At the right side, again carefully slide the bottom case slightly up and away from you by pushing it just above the hinge of the display, and at the same time from within the battery compartment, pushing away from you at the
4 - PowerBook G4 AirPort Card