Card Shuts Down Computer

[NightyNight]

I just built a computer.I have the sufficient power supply needed by the card, and motherboard (A ThermalTake 400w). I bought a brand new GeForce 6600GT XFX Card. Everything is compatible. When I plug my card in my AGP slot, and plug power in, my computer turns on, and after about 2 seconds, turns off.

When I unplug my card from power only, the computer goes up fine. It does this while still connected to my mobo.

Does anyone have an explanation why it's doing this?

 

[V0ltage]

Seems your PSU is too weak, get a new one.

 

[NightyNight]

I have it set at 115V, would it work if I turned it to 230?

 

[V0ltage]

Turning it to 230V will just make it not work.