My friend recently built a PC just the other day, and we connected his pc to monitor with hdmi cable and the screen and it comes up with no cable connected. So we ended up just using dvi connection with works perfectly fine. (By the way, yes we are using the hdmi port on the gpu not the motherboard, and the same with the dvi) so i have no idea what the problem is. We tried to different hmdi cables aswell but nothing worked, and mind you these cables work on consoles perfectly fine so it's not the cables. PLEASE HELP