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my copper shim came it today, so i went to it. pulled off the stock cooler. put the little sinks on the ram, put the block on. koolance gpu-220 by the way, with TIM in between the die/shim and shim/block. plugged it in.....nothing. tried using a dvi cable instead of hdmi, still nothing. pulled everything back apart. didn't see anything that was wrong, so i stuck the stock cooler back on so i could send it in to sapphire. put it back in my rig, just to see......and it came right on!?! what did i do wrong? someone help me figure this out cause i'd really like to have this thing under water