get an antec trupower trio. anything above 400W. im running an 8800GTS 512 off one with no problems atall.
see what happens with that, then if there's still nothing im thinking something's up with the motherboard. remove all unnecessary components and see if it turns on.
see what happens with that, then if there's still nothing im thinking something's up with the motherboard. remove all unnecessary components and see if it turns on.