I have run into a problem with the power suply upgrade. my current has a fan on the backside, most i have been looking at online have the fans ontop of them, now can i just turn them over and have the fan on the bottom? I have done many upgrades on computers but im unsure of this and i dont want to screw it up. any suggestions on that? i think i may have to get a new tower and just install my components in that honestly.