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Z370-F Strix and 1080TI black screen on DP

Level 7
I recently bought a Z370-F Strix Gaming motherboard wit ha 8700K CPU.
I am using a 1080TI Strix graphicscard.
When turning on the system, the screen of my 2k iiYama( which is on a Displayport) stays black. My 2nd monitor which is on DVI works just fine.
Also tried the intel 8700k gfx, but also a no go on DP.
I installed windows 10 pro using the 2nd monitor, then installed the gfx drivers my graphics card worked. I can';t even go into the EFI/BIOS on my main screen.

I updated the BIOS and still the same problem. My previous system had a Z97 Sabertooth MARK 1 motherboard and everything was just fine.

Any idea's?