Hi I am installing a Samsung SP0842N Hard drive on my old PC. I took of the ribbon cable off the old drive and put it on the new, but the other cable (i think its power) wont come off. It has four wires in a sort of white plastic thing. Left to right: red, black, black, yellow. It seems like its stuck, so plz help to tell how to take it off so i can hook it up to my new drive.