display - Dell U2312HM flickering

I bought a DELL U2312HM a year ago. I was actually preparing to buy 2 new monitors as this model.

It worked very well until a couple of hours. It started to flicker badly on the right side of the monitor. It has horizontal lines waves. The monitor's frequency is 60Hz at 1920x1080. When I do the colour test, the most affected colour is grey, followed by green and then white. I've switched between multiple computers with very different setups and all I get is flickering. I thought that maybe the display drivers are the problem, so I've reinstalled all of them again, but nothing got better.

I need to have good monitors because I have lots of work, especially this summer. What do you think? What's problem? And how can I fix it? It's urgent to me. Replacing it with something less capable would "kill" me. I still have warranty, but their service is crap. I'm not in the US.

The fact that the problem persists on multiple computers indicates wither a cable or monitor fault (assuming you took the cable to the other PCs).

The fact that it persists on the monitor colour test rules out cables leaving you with the fact that you have a hardware failure.

You still have warranty - so use it! I knwo the service with some major manufacturers is bad - but this is your only real choice.. that or forget the warranty and purchase a new screen.

Sorry to be the bearer of bad news.