Flickering lines on screen

[Teagirl]

Hello,
Yesterday my screen started displaying flickering lines on the side and bottom of the screen and the menu is on both the top and bottom. Does anyone know what the issue might be?

I’m running a MacBook Pro Retina, Mid 2012 on High Sierra 10.13.6, Intel HD Graphics 4000 1536 MB

 

[lambertjohn]

It's ten years old.

 

[Willo34]

Screen or logic board