Well, my friend to went to best buy he bought some DDR2 ram, takes it home realizes that its the wrong ram after trying to put it in, he puts his other ram back in (the working one) He restarts his comp, and it looks like it is going work fine. Then it stops working before it gets to the windows loading, he then tries to re image it, and it too looks like it will works fine, then it goes to black screen. What does he do? He checked his motherboard for loose cords ect, and thinks everything is ok.