Locate the battery release tab on the underside of the G4. Slide the battery release tab to the left and lift the battery out of the computer. /Guide/Installing-PowerBook-G4-Titanium-DVI-Airport-Card/88/all#s3310 Locate the battery release tab on the underside of the G4. Slide the battery release tab to the left and lift the battery out of the computer. /Guide/Installing-PowerBook-G4-Titanium-DVI-Airport-Card/88/all#s3310 Remove the seven T8 Torx screws from the lower case. /Guide/Installing-PowerBook-G4-Titanium-DVI-Airport-Card/88/all#s243 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 optical 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/Installing-PowerBook-G4-Titanium-DVI-Airport-Card/88/all#s244 Your laptop should look approximately like this. /Guide/Installing-PowerBook-G4-Titanium-DVI-Airport-Card/88/all#s245 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/Installing-PowerBook-G4-Titanium-DVI-Airport-Card/88/all#s246