Well, the system is sorta dead, so I can't really test the system at all...Without the GPU connected, the system chassis is able to light up, but nothing will light up at all if the GPU is connected. But I have no idea how to get a video output from my Asus X370 Pro motherboard as I usually get my output from the GPU. Yes, the Asus X370 Pro has a HDMI port, but when I try to connect my monitor there, I don't get any signal.