After looking at the prices on these boards $750-850, consider using someone like DT&T services. They will repair your logic board for $350. http://www.dttservice.com/macbookprosilv...

Hi, I would like to offer you this suggestion but first I must ask you a questions; 1) have this unit ever had any type of a heating issue (been hot at some point in the past) and 2) have you or anyone been inside of the "top cover (in other words, have the top cover with the key pad been opened up)?" If so then it is possible that the screen cable may have some loose wire connections within that part that plugs into the logic board. This cable is on the right side of the board just below the fan towards the left (it have around 10-12 different color wires going into one connector).

You can remove that connector by pushing it out and lifting it up then hold the metal connector end with one hand and with the other, just grab the entire section of those wires and give them a slight twist (back and forth) and then PUSH the wires (with a very small amount of pressure) into the metal piece in your other hand. Now without DISTURBING that connector, lay it back down to the socket that it came from, line it up with that part on the logic board and push it in gently by the VERY outer edges ONLY. Place the top cover back down (don't screw anything down yet), turn it on and see what you get. If it looks okay, then just let it run while you try out your videos. If those old problems don't show up any more then you can celebrate and dance.