Apple G5 - page 158

156 - iMac G5, 17-inch Take Apart Logic Board
13. Carefully lift the logic board out of the midplane chassis. Do not flex the board as you
remove it from the chassis or you may jeopardize the thermal interface between the
heatsink and the processor.
14. Look on the back of the logic board for the light pipe. If you are replacing the board,
remove the light pipe. Attach this light pipe to the gasket on the replacement board.
15. If you don’t see the light pipe on the back of the logic board, it may be stuck in the
chassis (shown below). Use a needlenose pliers to remove the light pipe.
16. Return the logic board to Apple in the packaging provided.