My Problem

This cable solved the problem, the computer couldn't sometimes see the hard disk but computer worked with usb drive so I figured it might be the disk or the cable.

My Fix

Smooth!

My Advice

You see pretty much what you have to remove to get the old cable out, and it's just doing it in reverse when installing the new one. You have to loosen the aluminum bar that sits between the battery/hd and logic board, in order to remove the rubber grommet on the hd-cable. You just loosen 3 screws and place em on the magnets.