Hi there. I purchased the above monitor new in 2015. After about three months I started to get a thin red vertical band running from top to bottom of the screen. I tried factory reset and powering off. It sometimes goes away and then returns.

I can undertake a LCD Conditioning and sometimes this removes it as well. It always returns after a while.

It is now here on the screen all the time.

Running a late 2013 Mac Pro (cylinder) and using two cables for 5K. I have tried a single cable for 4K and it is still there. I also have a Dell U2515H connected.

Any help, suggestions what could be causing this, as it is now really annoying for the type of work I do.