1080 ti won’t get detected by mobo

Hello,

Today I got my new pc parts: Asus z370-f gaming mobi I7 8700k cpu 1080ti gpu.

My problem is that my mobo doesn’t detect my gpu and it gives a black screen when I plug my hdmi into it. I tried reseating, other pci slot and 2 8 to 6+2 psu cables and 1x 8 to 6+2 and bios update.

Any suggestions?