I have an evga 7900gs, and I just recently replaced my RAM and hard drive in my system, so I had to reinstall windows. Back in the day when I first built my system, I had a lot of instability and a lot of it seemed to come from my graphics card overheating. After this fresh install of windows, I figured I would try to lower the clock speeds on my card to make my cooling issues a thing of the past. I set the clock speeds to (i think) 500 core/660 mem (those were the default 2D speeds). Now whenever I boot up I see the POST screen and then after that I don't see a damn thing. Everything just goes black. I know windows loads because I pressed the windows key and did a shutdown with my keyboard, but I have no idea how to get my clock speeds back to default so that I can actually use windows. Please please please, does anybody have a solution that could remedy this problem that doesn't involve reinstalling windows?