6.Use one of your hands to hold up the subassembly at an angle or have someone hold it up for you. With your other hand, reach under the subassembly and disconnect the hard disk drive cable attached to the front of the main system board.
The hard disk drive cable is connected to the socket that is closest to the front of the computer, as shown below. Grasp the connector and pull it straight up to remove it from the socket. Do not pull only on the cable.
drive cable
7.The diskette drive cable is connected to the socket just behind the hard disk drive socket. Disconnect this cable in the same manner.