I'm writing to you on a screen that is rolling and sometimes flickering right now. I've tried 3 different screens on the same outlet, and they all have the same problem.
1. If you have any speakers near your monitor, try moving them away, this might help because they might not be shielded enough.
2. Try another screen, if the problem persists, it may be your power outlet.
3. If you don't want to spend money on a new screen, spend some time looking for a 3-prong grounding adapter.
I used the 3-prong grounding adapter, those little adapters that plug into the wall using 2 prongs, and then you can plug a 3 prong appliance into them on the other site, and it helped make the rolls not appear as often, and not as dark.
I think it is something with my power or the plug I am using.
Hope this may have helped a tiny bit