How to fix black thin lines on the screen ?

[Ertan_96]

I got black lines on the screen , when i make screenshots they can't be seen , so that means it is because of the monitor.. Can anyone help?

 

[EddGamesHD]

Have you tried plugging in a different device and see if the black lines are still present?
If the black lines remain then you should buy a new monitor
If not, then the GPU is the issue