Problem w new XFX Geforce 6600GT

Hi,

I just assembled a computer for myself and I'm having problems with the
video card. This is the system:

Antech Case and 350W PSU
MSI K8T Neo 2 mboard
Athlon 64 3200 Socket 939
XFX GeForce 6600 GT
2* 512MB PC3200 Crucial RAM
120GB SATA WD Drive
1 DVD Burner/CD Burner
21' CRT at 1024*768.

So I put it all together and installed and updated VIA Chipset/AMD,NVidia
drivers. The problem starts when I run aquamark or 3dmark. The screen goes
blank and my monitor indicates that there's no video output. I restart and everything is fine unless I run the tests again.

Secondly, the performance on NBench is low, about 2400. I dont know what
could cause that. I'd appreciate any advice about every part and driver etc
that I need to tweak/change/update. Its the first computer I've built and
everything could help.

thanks

Prakrit Jena

Don't forget, this card requires a seperate connection from the power supply. Double check that, I made the same mistake :)

You need a more powerful power supply, IMO.

Dude, check your 12volt rail.

more power

350 watt PS isnt cutting it