I have an EVGA 780i SLI Motherboard and 4 sticks of Corsair XMS2 DDR2 800 MHz 1GB each. Now I know they for sure all work, because I tested each one seperatly, and I know each slot on the motherboard works as well. The problem is, when I put in a stick in each slot to fill 4 slots I would sometimes get it past post, but now it never posts, and I get the LED error thing that says 52, however when I take out one stick everything works fine. Any ideas?