The VisionTek 700W is a horrible power supply.
I'm not surprised that it died. You have to hope that it didn't kill any of your other system components.
When you look at the OEM (i.e. Leadman/ Zhao Li), lack of internal component quality and design of that power supply unit, it doesn't even seem like a passable 500 Watt power supply. It also suffers from poor voltage regulation.