How do I fix black vertical lines on monitor?

First, try restarting your PC and check if the cable’s loose — that’s the most common cause.

If that doesn’t work:
  • Try a different cable or port.
  • Connect the monitor to another PC (or vice versa) to see if it’s the monitor or the computer.
  • If the lines show up even in the monitor’s menu, it’s probably a hardware issue.
Sometimes it’s just a bad cable. Other times, sadly, the screen’s going bad.
 
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