Cyan line dotted on screen, OSX or display issue?

Hello

I actually sometimes a (non-continuous) dotted line cyan (attached image) in the left side of my screen.
Sometimes it disappears or come back again after the reboot. Is this a problem on OSX or it s a monitor/screen-hardware problem.

How can I turn it off?

Thank you.

Mac mini (late 2012) OSX 10.11.3 2.3 GHz i7 16 GB RAM Intel HD Graphics 4000 1536 MB

267 GB free on hard disk.

Display: AOC 27 inches (1920 x 1080) 2769M model.

I think its hardware partner.

Tags: Mac

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