If the same thing is happening on multiple monitors, the problem is most likely with the Video Card.

You /might/ be able to fix it by re-seating it (take it out, then put it back in)

Here are some steps you should follow if you are going to try this (providing you are able to open up your PC case)

First, very important, shut down the computer and unplug it from the power source.

Open up the computer box.

Find the 'card' that the monitor gets plugged into. See if you can take it out and then put it back in (screws may be involved)

You can google "how to replace a video card' and probably find a YouTube instructions, search for your specific model of PC for best results.

Good luck!

Saw a bent pin turn a screen green

Then try reseating the video card.

My next step was to call the Geek Squad. Thanks to you and all!

...for all your work on MIRT. I volunteer often but my time is usually limited.
Best of luck with it.

Waste is the enemy of the frugal.
"Use it up, wear it out, make it do, or do without." - Boyd K. Packer

Plus, I enjoy it.

...that one who is not paid for his work is an amateur. That characterization is often used to disparage the skill, talent or results delivered by the amateur. As I've seen here in the case of folks on MIRT and the volunteer hosts, they are all good at what they do. I will be volunteering again soon for MIRT and trying to live up to the example of some of the greats of which you are one.
You have a few fans out there so know that what you do is appreciated.

Here are the lines delivered so well by John Houseman to the other characters playing a choir that was practicing Händel's The Messiah:

I do enjoy doing this, and do my MIRT compatriots. It'll be good to see you back among the ranks when you do so.

Have a very Happy New Year!

Same to you.