i've replaced my PSU (to the PCP&C) but i still have nothing on teh 3.3v rail according to Speedfan. however, on everest i have normal voltages. and when my GFx card goes to high load, my system shuts down. and i feel no air coming from my GPU's heatsink. i'm guessing this means my GPU is fan is burnt out, but how? why? and how can i fix it?