dusty8877

I just got a new graphics card today (nvidia 7900 gs) i tried installing it and then when it was time to turn it on my computer did not turn on. It was turning on yesterday fine with the old graphics card so i tried to put back the old graphics card and tried turning it on and nothing happend. I tried to unplug the power cable several times and still nothing. My specs are:asus p5nsli mobo nvidia 6600 (hoping that the 7900 will work) 1024 ddr2 pc 4200 ram 400 watt psu maxtor 130 gb and lite on dvd/cd combo. Anyone..that could help i will really appreciate it. Oh and when i turn on the psu i see the little green light on the mobo but it just wont turn on.