Apple G4 manual

Take Apart	Processor Module, PCI Graphics - 40
	1. Remove the screw that
	attaches the heatsink
	ground wire to the logic
	board.
	±Warning: The heatsink
	may be hot to the touch. If
	the computer has been
	operating, allow it to cool
	down before continuing.
	2. While pressing down on
	the top of the heatsink
	clip, use a small
	flatblade screwdriver to
	release the clip by
	lifting up and out on its
	center front tab.