How to fix horizontal lines glitching around the screen.

WiiUMasterGman

Reputable
May 11, 2016
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I have bought a used monitor. Everything is working fine except there are horizontal lines glitching up and my screen. It's fine when I am doing nothing but as soon as I start doing something it just glitches. I have seen others have the same problem. They are both 60Hz but one has like 59.xxxx and the other has 59.xxx. What do I do?