Apple iMac G5, 20-inch - Manual (Page 63)

iMac G5 (20-inch) Take Apart - Logic Board
10. Use a needlenose pliers to disconnect the three connectors near the bottom left
corner of the midplane. These cables connect to the speakers, microphone, and the
fan. Note: Pull on the connector, not the cables.
11. Using a T-10 screwdriver, remove eight silver logic board screws and with a Phillips #2
screwdriver, remove one brass screw in the bottom left corner of the midplane. Note:
The numbers are the replacement order, disregard for take-apart.