Screen cable ribbon tear

Hi,

So because of opening up my phone a couple of times, the cable on my atrix 4g which is supposedly connected to the screen (according to the tear down ) has developed a taer on one of the corners and because of that the screen doesnt seem to power on. I never took off any cables just removed the motherbopard a couple of times (therfore had to disconnect the cables from it). Can i get just the cable from somewhere online or my whole screen needs to be replaced. The screen worked perfectly before this happpened.

Thanks