Pull the medium-sized 9 pin ribbon cable and the small 5 pin ribbon cable out of their connector in the motherboard.

Using tweezers, lift the black tab on the connector of the large 45 pin connector on the motherboard.

Pull the large 45 pin ribbon cable out of the connector in the motherboard.

Be very careful. The goal is to slightly lift the pin connector, not to completely detach it. Do not forcibly pull.