100 - iMac G5, 17-inch Take Apart Midplane Assembly
7. Turn the middle case screw to the right about five revolutions. This releases the back
cover clamp screw.
8. Locate the pull tab at the top of the computer. Pull the tab up to lift the midplane
assembly from the display/bezel. Push the cable (in the top left corner) down through
the opening in the midplane. Set the midplane aside.