Hi, if the problem still exists, you could try changing the monitor cable (cable between PC and your monitor). If you need to buy one, you may not want to buy cheap. Since I use a tripple shielded cable, my monitor flickering problem is gone for good.

no, everything is ok. Must be your monitor, i'm afraid.

Good afternoon Grandadfun,
Have you tried checking all the connection cables? try factory resetting the monitor, if you see the problem continues consider replacing it with a new one.

Good luck and best regards
Dav7d