Quote Originally Posted by spankege View Post
350w is way to small. It was probably just enough to run your hardware and when you added the fans it was to much so nothing happens. Upgrade to at least an 800 watt then you will have more than enough power to run those fans or even an upgraded video card. Tigerdirect.com always has decent prices.

Cody
The OP isn't running a computer, just the fans for a negative pressure box.