this is the card i have. and also, how could it be the psu ? A friend of mine has the exact same psu but he has a 9800gt super plus and his works fine. and the minimum wattage for a 9600gt is 400 .
It's more about amperage than it is about wattage. You could have a 1000W power supply, but if it doesn't have enough amperage on the 12V power lines (for video card) it won't work.
Either your PSU isn't giving the video card enough power, or your video card is bad.