Remove the fan wire from its plug on the top metal casing.

When removing the wire, do not pull from the wire. Instead, pull from the white plastic male connecter.

Remove the motherboard from the top metal casing. Lift from the side with the two USB plugs to avoid damaging the four back ports.

There is a thermal compound between the top metal casing and the motherboard in the center, so you may have to apply more force than usual. Do not force the two pieces apart, but slowly apply more and more pressure until the adhesive gives.

During reassembly, remember to replace the old thermal compound, as it cannot be reused.