So I recently made a computer (Radeon 390x, EVGA 850W, Asus Z97 Pro Gamer) everything worked fine for the first day then I noticed I was using integrated graphics, so I tried to switch to my graphics card. At first I was using VGA cable for integrated graphics so I had to switch to DVI cause of the graphics card. After I switched to dvi my monitor is black (the monitor works because when I unplug the DVI cable it says no signal) so I tried to switch back to VGA but it says no signal. I cannot use my computer because if black screen. Help please