I just installed the Zalman GPU cooler to my GTX480 and I know I installed the HS to my card perfectly, but for some reason, when I turn on my computer and get to the Windows logo screen, I am seeing major video artifacts. I do have an additional GTX 480 so I can use my computer, but it would be nice to nail down what the problem could be. Any suggestions? I do have the GPU connected to the fan controller and motherboard as recommended.