DisplayPort won't boot

[yasincengiz]

Mobo: Gigabyte B450

GPU: Asus Turbo 1080Ti

CPU: Ryzen 5 3600 (stock)

Ram: Corsair 3000MHz 2x8GB

PSU: Zalman 700W 80+

Display: Samsung C27HG70QQM

 

When I connect with a display port my pc won't boot. I have those small speakers in the mobo and that beep sound won't come. If I connect with hdmi it boots up normally then I connect DP and change to that but even then display starts closing and opening every couple minutes. I changed to another cable but it didn't fix. How can I fix this?

 

I need DP for freesync and 144hz HDMI doesn't support both.

 

Edit: Because on samsung site it doesn't say clearly the version of the DP I went and bought DP 1.2 cables. According to this site monitor has 1.4 could it be the issue? 

https://pcmonitors.info/reviews/samsung-c27hg70/

 

Edit 2: Didn't get the proper manual but found it on the site it says dp 1.1-2-4 is supported still no idea what's causing the issue.

https://gzhls.at/blob/ldb/5/e/f/6/9bb00ad66b3fdc4314f20946d64ca4bbe7ac.pdf