Displayport connection isn't working with new OMEN X 27

[RobNAC]

Hello, not sure if i'm in the correct board but i'm having troubles with my new Monitor. I've recently built a PC and changed monitors along with it. My first money works perfectly and is connected via display port (different brand) but this Omen x 27 will not work. They are both connect to the motherboard display ports and the GPU is brand new (7900 XTX). The Omen x 27 will work with a HDMI connection but the display port won't. I've troubleshooted by using a different monitor and swapping ports etc and it all works apart from when using the Omen x 27. It just tells me (Input signal not found, Check the video cable etc). Any ideas on how to fix this? I've tried drivers and everything but nothing works. 

[banhien]

@RobNAC 

How do you connect them ?

Regards

[RobNAC]

I connect them both with display port cables into the graphics card display port slots 

[TheOldMan]

Here is the User guide  http://h10032.www1.hp.com/ctg/Manual/c06427949.pdf

Page 14 describes how to use the Display Mode and switch between inputs.

You might also need to right click on a blank part of the desktop and then pick "Display Settings" and the pick "multiple displays" and following to get Windows setup properly for two displays.