Sorry but what is the video card? i've read some peoples saying that this psu could not handle even 386watts but i'm not sure if that was real (internet), if your graphics card requires more than that this kind of problem could be hapening, this kind of problem really looks like psu problem, but there is also the chance of beign the video card, if you can try it with another PSU otherwise return the card, and if the second one didn't work properly you know what the problem is...
It is recommended to use Active PFC units, they normally are safer;