Is anybody know what could breake a power supply. Someday ago, a client had call me saying that is pc have shut-down during boot a now this piece of junk don't boot anymore. I've suspected the power-supply, so I buy a new one (300W atx to replace a 250w atx). I put it into the tower. When I press power everything works fine and windows booted. 30 seconds after, the pc shutdown and a white smoke came from de new power-supply. Is anybody know what could make this new power-supply burn like the old one?