so you get no post? (boot beep) if not.. take out all your Ram, GPU and any other slot cards you have in.. then replace them back in 1 by 1 and try booting first with none.. then one at a time, add 1 stick of ram see if it posts add the GPU and see if it posts.. but try with none first as I said and that will tell you if one of your slot cards is causing your problem.