I upgraded my psu (hx1200i) and now I'm turning my pc on and everything works fine but I can't get signal it's only a black screen and my monitor says dvi no signal... yes, I checked if my pcie was fully connected to the psu and it was. yes, the power cable is plugged all the way in. I don't know if the gpu slot is broken and I think the gpu is all the way in the slot... HELP ME