My largest cruncher has been giving me fits for months now. Started by locking up the keyboard and mouse. Thought it was part of WIN 7 power management. Later it started to go to Blue Screen, with memory dump. So far I have ran it with 1 chip each time in memory slot 1 to check the chips (4GB DDR3 each) BSD every time. Reloaded windows on a new HD and reinstalled all drivers. No joy. Ran it with only 1 of the GTX 570's plugged in at a time. No Joy. Moved all the SATA connections to different slots. No joy Checked MB connections. This box never blows hot air since it has 4 onboard fans, 2 of the extra large variety. Chip isn't running warm also. PSU is 80+ Bronze, 750 watt.
Any other ideas would be helpfull.