Please describe what occurs before it fails. No Post No Beep, Doesn't display in Windows, etc, etc. It'll help determine if this is a power issue or not.
Personally, I have a 220 watt startup/shutdown controller using an 8200 video card and it runs just fine. The card may be just seated inproperly or the motherboard might have a special port on it for P.O.S. systems. Alot of the industrial motherboards have them and you have to tell it to use AGP/PCIE instead.