2.Locate the hard disk drive ribbon cable that came with the computer. It is a flat cable with three connectors: one on each end and one in the middle, as shown below.
3.Select the connector on the end of the longest part of the cable (the main system board connector). Notice the small tab in the middle of the cable connector, as shown in the illustration above. Align the connector so that the tab faces the back of the computer (toward the option slots), as shown below. (The option card connector board and diskette drive ribbon cable are removed from the illustration for clarity.)