I also wanna to say that it's not only the vertical green lines , it gives also blue and other color i dont remember. Imagine im on BF3 , then my pc makes BRRRRRR with the green lines and shuts down , if i restart my pc and go to BF3 again , it will crash again but this time a different color. I rly think it's the GPU. As i said in this post it could be 1 bad capacitor . i checked the capacitor and i got at least 1 or 2 bent.