Use a coin to turn the battery locking screw 90 degrees to the right. Lift the battery out of the computer. /Guide/Repair/PowerBook-G4-Aluminum-12-Inch-1-1-5-GHz-Hall-Effect-Sensor/545/all#s2569 Remove the four Phillips screws from the memory door. Slide the memory door away from the memory compartment. /Guide/Repair/PowerBook-G4-Aluminum-12-Inch-1-1-5-GHz-Hall-Effect-Sensor/545/all#s2572 Remove the long black Phillips screw next to the memory card. Remove the small EMI finger beneath the black screw. /Guide/Repair/PowerBook-G4-Aluminum-12-Inch-1-1-5-GHz-Hall-Effect-Sensor/545/all#s2573 On the keyboard, remove the F1, F2, F11, and F12 keys. This is scary - take a deep breath before continuing. Place your index finger under the upper left corner of the key and lift up until you hear a click. Then, transfer your finger to the left edge of the key and lift up to pull the key off. You're freeing the two tabs on the left of the key from the two small holes in the plastic scissors mechanism. When replacing the keys in the keyboard, place the key directly over the slot where it will go and press down until you hear the key click into place. /Guide/Repair/PowerBook-G4-Aluminum-12-Inch-1-1-5-GHz-Hall-Effect-Sensor/545/all#s2577 Use your fingernail or a small flathead screwdriver to peel up the gray stickers covering each of the screws. /Guide/Repair/PowerBook-G4-Aluminum-12-Inch-1-1-5-GHz-Hall-Effect-Sensor/545/all#s2578 Remove the two short Phillips screws. /Guide/Repair/PowerBook-G4-Aluminum-12-Inch-1-1-5-GHz-Hall-Effect-Sensor/545/all#s2579 Lift the keyboard by the 'esc' and 'eject' keys and gently lift up until the keyboard is vertical. /Guide/Repair/PowerBook-G4-Aluminum-12-Inch-1-1-5-GHz-Hall-Effect-Sensor/545/all#s2580 Grasp the keyboard connector ribbon near the connector and disconnect it from the logic board. /Guide/Repair/PowerBook-G4-Aluminum-12-Inch-1-1-5-GHz-Hall-Effect-Sensor/545/all#s2581 Remove the three small Phillips screws from within the battery compartment. /Guide/Repair/PowerBook-G4-Aluminum-12-Inch-1-1-5-GHz-Hall-Effect-Sensor/545/all#s2582 Turn the computer 90 degrees clockwise and remove the two Phillips screws from the casing. /Guide/Repair/PowerBook-G4-Aluminum-12-Inch-1-1-5-GHz-Hall-Effect-Sensor/545/all#s2583 Turn the computer 90 degrees clockwise again, and remove only the bottom screw on either side of the hinge. /Guide/Repair/PowerBook-G4-Aluminum-12-Inch-1-1-5-GHz-Hall-Effect-Sensor/545/all#s2584 Turn the computer 90 degrees clockwise just one more time, and remove the two Phillips screws on the exterior wall of the battery compartment. /Guide/Repair/PowerBook-G4-Aluminum-12-Inch-1-1-5-GHz-Hall-Effect-Sensor/545/all#s2585 Turn the computer over and open it up. Remove the following 13 screws: Six 2.5 mm Phillips on either side of the keyboard area. Five 4.5 mm Phillips on the left half of the keyboard area. One 7 mm hex in the upper left corner of the upper case (a T6 Torx driver will do the job nicely). One 15 mm Phillips in the upper middle of the keyboard area. One 16.5 mm hex in the upper right of the upper case (again, a T6 Torx driver will work well). /Guide/Repair/PowerBook-G4-Aluminum-12-Inch-1-1-5-GHz-Hall-Effect-Sensor/545/all#s2586 Peel up the two pieces of foil tape on the left side of the keyboard area. The connectors at the ends of the cables are attached very firmly to the sockets on the logic board. Pulling directly on the cable will either separate the cable from its connector or the socket from the logic board. Carefully disconnect the microphone and power cables from the logic board. Using your fingernails or a dental pick, carefully pry the connectors from their sockets. Make sure you're pulling only on the connector and not on the socket. /Guide/Repair/PowerBook-G4-Aluminum-12-Inch-1-1-5-GHz-Hall-Effect-Sensor/545/all#s2587 Use the orange plastic loop to disconnect the trackpad cable. /Guide/Repair/PowerBook-G4-Aluminum-12-Inch-1-1-5-GHz-Hall-Effect-Sensor/545/all#s2588 Starting at one of the upper corners near the screen, work around the frame, separating the upper case from the lower case. /Guide/Repair/PowerBook-G4-Aluminum-12-Inch-1-1-5-GHz-Hall-Effect-Sensor/545/all#s2589 Lift the upper case off the computer. /Guide/Repair/PowerBook-G4-Aluminum-12-Inch-1-1-5-GHz-Hall-Effect-Sensor/545/all#s2590 Remove the single Phillips screw from the hall effect sensor board on the right side of the computer. Deroute the cable connecting the hall effect sensor board to the DC-to-DC board. /Guide/Repair/PowerBook-G4-Aluminum-12-Inch-1-1-5-GHz-Hall-Effect-Sensor/545/all#s2592 Disconnect the hall effect sensor cable from the DC-to-DC board. /Guide/Repair/PowerBook-G4-Aluminum-12-Inch-1-1-5-GHz-Hall-Effect-Sensor/545/all#s2593