Weird line appears in corner
I just bought two Thunderbolt Displays from a single seller on Facebook Marketplace,
I briefly inspected the displays and did not notice any issues, when I connected the displays to my Mac mini at home after about five minutes the attached started to appear on the screen,
I tried connecting one of the monitors to my MacBook and again after five minutes the lines appeared, any ideas what this issue could be, is there any way to fix it or did I just get screwed out of my money?
Any help would be greatly appreciated!
I also noticed that if I leave the display on the line starts to extend to the bottom right corner and then disappears, it’s really weird.