Turn the G4 over. Remove the eight Phillips screws from the lower case. /Guide/Repair/PowerBook-G4-Titanium-Mercury-Airport-Card/61/all#s159 Using your thumbs, slide the lower case away from you. The lower case may stick in the front on a tab just above the center of the DVD drive. Be careful as you work the case off, or you may break the thin strip of plastic just above the drive. Lift the lower case off. /Guide/Repair/PowerBook-G4-Titanium-Mercury-Airport-Card/61/all#s160 Your laptop should look approximately like this. /Guide/Repair/PowerBook-G4-Titanium-Mercury-Airport-Card/61/all#s161 Skip this step if your computer does not have an Airport card. Firmly grasp the plastic tab attached to the Airport card and pull up and to the left. Disconnect the antenna cable from the left side of the Airport card. /Guide/Repair/PowerBook-G4-Titanium-Mercury-Airport-Card/61/all#s162