Remove the three small screws from the USB board, and remove the USB board.

Remove the two small screws from the VGA board.

Remove the one long screw from the VGA board, and remove the VGA board. This is a tight fit and may require a little jiggling to remove/replace.

Remove the five small screws from the motherboard.

Remove the four long screws from the motherboard/CPU cooler.

Remove the two short screws from the DP/USB/Firewire board.

Remove the two mid-length screws from the left speaker, and disconnect the speaker connector from the motherboard.