I installed a new video card (eVGA 6800GT) and memory (2x512 Crucial DDR4 PC3200) a few nights ago, and since then have been crashing a whole lot. Games freeze, or crash to desktop. I get the "blue screen of death" a whole lot, randomly, it seems. Does this sound like a power supply issue? I have a 350 watt power supply, but that's the minimum for this video card. I've tested the memory and it's fine.