Second screen flikering horizontal lines

[DiegoLavega77]

So i just assembled my computer into a new case, and after starting up again everything seems fine but when i play something intensive in general my second screen starts flikering with horizontal lines. Im leaving my old post which is the reason why i changed my case and my PSU and its working fine now without shutdowns the only thing is really these horizontal lines of shade that show up erratically on the screen when im playing something heavy. I attempted to record the lines but i couldnt since the video would translate badly from my phone. I heard it has something with the refresh rates, being that i have a 144HZ monitor and a 60HZ to the right, im not sure really what to do in case thats the issue, ive even tried revering my 144HZ to 60HZ but it didnt help the second one fixing itself.

 

Any help would be deeply appreciated, thank you to everyone in advance.

 

(Full list of specs except the PSU are listed on this post)

[samcool55]

What happens if you only use the second monitor?

Just as a test.

[DiegoLavega77]

8 minutes ago, samcool55 said:

What happens if you only use the second monitor?

Just as a test.

 

As i ran a game it still flikered, just like when both were on.