Display port not working on motherboard

[AMStoneparty]

Gigabyte z790 aorus pro x white. Paired with intel 15 13600k.

The hdmi works but the DisplayPort on the motherboard doesn't seem to show any display. I am currently using 4 screens in my set up. A small one in my pc, my 49 inch g9, and two other 1080p screens. I want to use the display port for one of the 1080p monitors and the hdmi on the motherboard for the small pc screen whilst the other two main screens which i will be using for gaming is plugged into the gpu.

Now i am able to run all 4 screens with the small pc screen using the motherboard hdmi but i paid £400 for my motherboard. I sure as hell want everything working even if i wont use it. I want to know whether i got a faulty one with a botched dp or whether im missing something.

Rest of the specs are ddr5 t force 32gb (2x16) running at 6000mhz. RTX 4070ti. 1000w corsair rmx psu.