Good Afternoon, I could use a fresh pair of eyes. My computer boots a rx 580 all the way into windows with both processors but the gtx 1080 will only boot with the apu and get only lights and fans with the ryzen 5. I started with a ASUS b350 board and then bought a used MSI B450 board. Same issue, except now (I think) the bios on the msi board is too new and doesn't support the apu chip. So, no life at all with the apu. I updated the bios on the asus b350 board to the last bios that still supported the A12 apu. No improvement. I have reseated both ram and gpu to no effect on both boards. Changed the ram out for different sticks, tried a different power supply. no effect. Gave the gtx 1080 to a buddy and he said the gpu works great in his machine. 4 or 5 months ago I tried a gtx 1050 ti and it worked fine, so don't think it's a nvidia vs amd thing. Also, I have only been using a hdmi cable, 'cause I don't have the right cables or ports on my monitor to use vga, dvi, or displayport. But hdmi works fine on one cpu but not the other. What am I missing? Any other info you would like to know?