Use a coin to rotate the battery locking screw 90 degrees clockwise. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s522 Lift the battery out of the computer. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s523 Pull the keyboard release tabs toward you and lift up on the keyboard until it pops free. If the keyboard does not come free, use a small flathead screwdriver to turn the keyboard locking screw 180 degrees in either direction and try again. Flip the keyboard over, away from the screen, and rest it face-down on the trackpad area. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s528 If the computer has an AirPort card installed, follow the next three steps to remove it. Push the wire clasp away from the AirPort card and toward the display, then rotate up to free it from the RAM shield. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s529 Grasp the clear plastic tab on the AirPort card and pull toward the display. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s530 Hold the AirPort card in one hand and use your other hand to remove the antenna cable. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s531 Remove the four silver Phillips screws that secure the RAM shield. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s532 Grasp the metal bracket on top of the RAM shield and pull upward to remove the shield. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s533 Pull the keyboard cable up from the logic board, holding the cable as close to the connector as possible. Make sure that you reconnect the keyboard cable before replacing the RAM shield. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s534 Use a pin (or anything you like) to remove the three rubber feet from the lower case. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s537 Remove the three newly-revealed Phillips screws. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s538 Use a spudger or small flathead screwdriver to pry up the three metal rings that housed the rubber bumpers. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s539 Remove the three Torx screws using a T8 Torx screwdriver. The shorter screw is in the center of the computer. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s540 Remove the two Phillips screws on either side of the battery contacts. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s541 Breathe deeply. Trying times are ahead, but we promise the lower case does come off. Push the thin rims of the lower case surrounding the battery compartment in, bending them past the tabs, and then lift up to free that corner of the lower case. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s542 There is a slot on the wall of the battery compartment that locks the lower case in place. Use a small flathead screwdriver to pry out the slot's lower rim and pull up on the lower case to free the slot from the tabs holding it. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s543 Run a spudger along the seam between the lower case and upper case on the front of the computer to free the tabs locking the lower case. Pull up on the lower case and continue to use the spudger as necessary until you hear three distinct clicks. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s544 Continue to run the spudger around the front, right corner. There are two tabs on the port side of the computer, one near the front corner and one near the sound-out port. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s545 There are three tabs over the optical drive that must be released before the lower case can come off. Slide the spudger into the lower case above the optical drive and run it toward the back of the computer until you hear three distinct clicks. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s546 Once the front and sides of the lower case are free, turn the computer so that the back is facing you and pull the lower case up and toward you until the back tabs pop free (it may be helpful to jiggle the case up and down). /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s547 Remove the small greasy springs with white plastic caps from either side of the battery contacts. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s548 Remove the 4 Phillips screws from the bottom shield. The two longer screws are along the computer's edge, near the ports. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s549 Lift the bottom shield off. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s550 Remove the two Phillips screws securing the DC-In board. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s553 Disconnect the DC-In cable from the logic board. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s554 Deroute the cable from around the optical drive, removing tape as necessary, and angle the DC-In board out of its compartment. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s555 Remove the two Phillips screws from the battery compartment. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s556 We recommend placing the computer on a slab of grey anti-static packing foam from this point on to prevent damaging the logic board. Turn over the computer and open it. Pry up the magnet covering a Phillips screw near the middle of the computer. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s557 Remove the following 7 screws from the edges of the keyboard area. Three 2 mm Phillips along the right edge. One 4.5 mm Phillips underneath where the magnet was. One 6 mm Phillips with a small head in the lower left corner. Two 6 mm Phillips with large heads, one in the upper left corner and one in the middle /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s558 Before you can yank the upper case off, you must disconnect the trackpad connector, the blue and white power cable, and speaker cable as described in the next steps. Lift the upper case from the right side and use a spudger or your finger to disconnect the trackpad connector hidden beneath the white plastic tab. Due to model variatons your trackpad connector may be different from the one pictured. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s559 Carefully lift the upper case about half of an inch and move it so that you can access the power and speaker cables. If the upper case is sticking, it may be necessary to free the tabs holding the upper case to the metal framework along the outer edge of the battery compartment. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s560 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. Lift the upper case enough to disconnect the blue and white power cable from the logic board. Using your fingernails or a dental pick, carefully pry the connector from its socket. Make sure you're pulling only on the connector and not on the socket. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s561 Lift the upper case off completely and disconnect the multicolored speaker cable from the logic board. As before, make sure you're pulling only on the connector and not on the socket. Tip: the multi-coloured cable may be easier and less daunting to disconnect after removing the top heat shield. Prop the top case upright while removing the shield - the connector is then much more accessible. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s562 Remove the following 15 screws: Fourteen 3 mm Phillips. One 5.5 mm Phillips in the upper left corner. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s565 Lift the top shield up from the right side, minding the upper left corner, which may catch on the metal framework. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s566 Due to variations between iBook G4 models, your modem may look slightly different from the picture. All of the following steps apply to either model. Remove the two Phillips screws at the corners of the modem. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s567 Lift the modem and modem shield from the bottom. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s568 Disconnect the RJ-11 cable from the top of the modem. When replacing the modem, seat the shield first, and then connect the modem and press it firmly into the shield, making sure that it is connected to the logic board. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s569 Lift the metal restraining bracket from the hard drive and place it aside. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s600 Remove the two Phillips screws securing the hard drive to the metal framework. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s601 Lift the hard drive up and remove the metal bracket, then carefully lower the hard drive back into its compartment. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s602 Remove the two Phillips screws from the white plastic fingers of the hinge grill. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s603 The 3.5 mm Phillips screw indicated below with a red circle may be absent in some models. Remove the following 5 screws and 3 nuts from the heat sink: One 3.5 mm Phillips from the lower left corner of the heat sink. Three 6 mm Phillips from around the fan. One 7.5 mm Phillips at the top right corner of the heat sink. One 4 mm nut from the side of the heat sink. Two 4 mm screw nuts with attached springs from either side of the heat sink. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s604 It may be necessary to soften the thermal paste between the logic board and heat sink. You can soften the thermal compound using a hairdryer. Move the hairdryer back and forth over the ribbed metal section of the heat sink for one minute. At this point, the heat sink should come free easily. Use a spudger to pry the heat sink up on the left side, near the hard drive. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s605 Grasp the heat sink in one hand and lift up the hinge grill in the other hand so that you can remove the heat sink from the computer. If you need to mount the heat sink back into the laptop, we have a thermal paste guide that makes replacing the thermal compound easy. /Guide/Installing-iBook-G4-12-Inch-800-MHz-1-2-GHz-Heat-Sink/172/all#s606