Vertical green line walking back and forth
 

Hello!

I use DL-5500.

A vertical green line, about one pixel in width, slowly walks back and forth across my monitor. This happens at any resolution.

What should I do to fix it?

This sounds like a hardware problem or interference being picked up on the video cable.

Wim

Guess you're right.

Resolved the issue by doing a factory reset of my AOC U2868PQU monitor after pointers from here: http://support.hp.com/us-en/document/bph05236#AbT4