ok soo i have a built computer and the psu went(400watt) i dont think it fucked up ne thing else .. but i was digging around came across another psu .. 250 watt and now .. my screen will not come out of standby ... is that due to lack of power from the psu .. or what .. i tryed to vid cards one is a gforce 6400 i think and the other one a ati not shur of model but yea the fans on the card kick on but no screen ? i need help