Follow these steps to install the hard disk drive in the vertical mounting position:
1.Place the hard disk drive on the right side of the subassembly with the mounting plate facing up and the ribbon cable and power supply sockets facing the back of the subassembly.
cable sockets
2.Locate the hard disk drive ribbon cable that came with your computer. It is a flat cable with three connectors, one on each end and one in the middle. (If you are installing a second hard disk drive, the cable may be attached to the other drive.)