This setup we are trying to go for is a dual SLI GTX 780, with an intel i7 4820K we got everything hooked up attempted to turn it on and the two GPUs then flashed and the whole build shut down. The Power supply fan turned on then off, as did all the other fans, the current PSU is a NZXT HALE 90 850W. Do we need a bigger PSU? The Power supply isn't faulty either.