This is the 2nd motherboard that has the same problem as the previous.
Only the 1st PCIe slot is working, if I insert the graphics card in the 2nd or 3rd slot, it won`t display absolutely anything. I have tried both DisplayPort and HDMI.
I have an Intel Core i7-7740x CPU and an Asus Strix GeForce GTX 1080 Ti GPU, the motherboard is powered by a Seasonic Prime Platinum 1000w 80 Plus PSU.
Thank You!!!
I didn't find the right solution from the Internet.