Use a coin to turn the battery locking screw 90 degrees clockwise. Lift the battery out of the computer. /Guide/Installing-PowerBook-G4-Aluminum-15-Inch-1-67-GHz-DC-Sound-Card/651/all#s3303 Remove the following 10 screws: Two 3 mm Phillips in the battery compartment, on either side of the battery contacts. Four 3 mm Phillips around the memory compartment. Four 16 mm Phillips along the hinge. /Guide/Installing-PowerBook-G4-Aluminum-15-Inch-1-67-GHz-DC-Sound-Card/651/all#s3309 Remove the memory compartment cover. Remove the two 12 mm Phillips screws on the Aluminum bracket at the top of the memory compartment. /Guide/Installing-PowerBook-G4-Aluminum-15-Inch-1-67-GHz-DC-Sound-Card/651/all#s3315 Rotate the computer 90 degrees clockwise so the power receptacle faces you. Remove the three 3 mm Phillips screws along the edge of the lower case. When replacing these screws, you must install them in the correct order. Begin by installing the screw closest to the display hinge, then work your way toward the front of the computer. /Guide/Installing-PowerBook-G4-Aluminum-15-Inch-1-67-GHz-DC-Sound-Card/651/all#s3316 Turn the computer 90 degrees clockwise so the hinge faces you. Remove the lower 5 mm Phillips screw on each side of the hinge (two total). /Guide/Installing-PowerBook-G4-Aluminum-15-Inch-1-67-GHz-DC-Sound-Card/651/all#s3317 Rotate the computer 90 degrees clockwise so the ports face you. Remove the three 3 mm Phillips screws along the edge of the lower case. When replacing these screws, you must install them in the correct order. Begin by installing the screw closest to the display hinge, then work your way toward the front of the computer. Also, be careful not to put the screws in the two holes on either side of the video out port. /Guide/Installing-PowerBook-G4-Aluminum-15-Inch-1-67-GHz-DC-Sound-Card/651/all#s3318 Turn the computer over and open the display. Remove the two 4.2 mm long, 1.5 mm hex screws at the top corners of the upper case (two total). A T6 Torx driver will work, but repeated use will strip the screws. /Guide/Installing-PowerBook-G4-Aluminum-15-Inch-1-67-GHz-DC-Sound-Card/651/all#s3319 Grasp the back corners of the upper case and pull up. Do not pull the upper case off yet; you still need to disconnect the keyboard and trackpad cable. Lift the back of the case up and work your fingers along the sides, freeing the case as you go. Once you have freed the sides, you may need to rock the case up and down to free the front of the upper case. /Guide/Installing-PowerBook-G4-Aluminum-15-Inch-1-67-GHz-DC-Sound-Card/651/all#s3320 Rotate the upper case up and toward the screen, so that the upper case rests against it. /Guide/Installing-PowerBook-G4-Aluminum-15-Inch-1-67-GHz-DC-Sound-Card/651/all#s3321 Remove the amber tape securing the trackpad ribbon to the logic board. Disconnect the trackpad ribbon from the logic board by pulling up on the connector. Remove the upper case from the computer. /Guide/Installing-PowerBook-G4-Aluminum-15-Inch-1-67-GHz-DC-Sound-Card/651/all#s3322 Remove the two 3 mm Phillips screws securing the left ambient light sensor. One is silver and one is black, or both black. Disconnect the cable from the Logic board and remove the left ambient light sensor from your computer. /Guide/Installing-PowerBook-G4-Aluminum-15-Inch-1-67-GHz-DC-Sound-Card/651/all#s3383 Remove the 4 mm hex nut securing the left speaker. /Guide/Installing-PowerBook-G4-Aluminum-15-Inch-1-67-GHz-DC-Sound-Card/651/all#s3384 Disconnect the left speaker cable. /Guide/Installing-PowerBook-G4-Aluminum-15-Inch-1-67-GHz-DC-Sound-Card/651/all#s3385 Remove the four Phillips screws from the PC card cage. The two longer screws go on the right side of the card cage. /Guide/Installing-PowerBook-G4-Aluminum-15-Inch-1-67-GHz-DC-Sound-Card/651/all#s3387 Disconnect the PC card cable from the logic board. /Guide/Installing-PowerBook-G4-Aluminum-15-Inch-1-67-GHz-DC-Sound-Card/651/all#s3388 Lift the PC card cage up and remove it from the computer. When replacing the PC card cage, make sure you attach it to the post on the metal eject button. /Guide/Installing-PowerBook-G4-Aluminum-15-Inch-1-67-GHz-DC-Sound-Card/651/all#s3389 Remove the silver Phillips screw. Remove the 5 mm hex nut screw. Disconnect the power cable and the speaker cable from the DC & sound board (connectors highlighted in yellow boxes). /Guide/Installing-PowerBook-G4-Aluminum-15-Inch-1-67-GHz-DC-Sound-Card/651/all#s3399 Lift the DC & sound card out of lower case, but don't remove it entirely as there are still cables connected. /Guide/Installing-PowerBook-G4-Aluminum-15-Inch-1-67-GHz-DC-Sound-Card/651/all#s3400 Disconnect the power cable from the DC & sound card board. /Guide/Installing-PowerBook-G4-Aluminum-15-Inch-1-67-GHz-DC-Sound-Card/651/all#s3401 Disconnect the RJ-11 cable from the modem. /Guide/Installing-PowerBook-G4-Aluminum-15-Inch-1-67-GHz-DC-Sound-Card/651/all#s3402