Not Sure What Happened To My Monitor/video Feed

I have two monitors, on my HP. They've worked fine for a year. Then a week ago, one of the monitors stopped working, so I purchased another monitor, and hooked it up. It worked fine. Then Windows did an update - it no longer works. All of my videos - tv shows, youtube, no longer work. It's like it's buffering for several minutes, I get a few lines, then buffer again. It's maddening.

I went in to the NVIDIA control panel, which is what I've always used, and noticed where ever (3 places I think) there was a choice, the option was set to "let windows decide" or something similar. I changed these back to "Use the NVIDIA setting".

Not a lot changed. Now when I go back in there, the options are "Use the Video Player Setting" and "Use the NVIDIA setting". The refresh rate is at 60Hz, which is the only setting available for 1920x1080. But I don't know if that was what the video should be set at.

My machine is an HP (EK1R450 I think), running Windows 10 Home. Intel i5-8400 CPU @2.80 GHz. 64-bit Operating system, x64-based processor. 8GB RAM.

The monitors are DELL, SE2216HV and SE2419H.

I am going to run Advanced System Repair Pro, but I'm not certain that will help. I am also going to restore the NVIDIA to original settings (I never changed them until a couple days ago, so I'm not sure that will help either).

The only other thing I can think of, and I believe this is the issue - is go back to 1 restore before the last update.

 

Swap the monitors around.
What happens?

 

I've seen this issue a few times with dual monitors, I usually just make sure everything is up to date driver wise and BIOS. I remember one time Dell sent me a reg fix until they fixed the drivers. When it goes out unplug the VGA/DP/HDMI of the one that is out and plug it back in, see if Windows detects it and it comes back on. Check power and sleep settings.