First off, I have 2 of these cards in SLI, 2nd hand off a close friend. Running my main card on BF3, it was getting to a rough 95deg after about an hour, standard clocks with fans operating at 70% on both cards. Decided to buy a new VGA Cooler; the Arctic Cooling Accelero Xtreme Plus II. Installed this all correctly, then placed it back in my computer, all carefully seated and everything. Now my computer won't boot. I have managed to boot off my 2nd card after reinstalling the original cooler onto the main card, but in Device Manager, apparently my 1st card is reporting problems. Are there any diagnostic programs or anything that could help with this situation?