After trying everything, I figured out that the problem was my older monitor that can't be updated (don't get me started). The problem started after the last Windows 10 update. I bought a new monitor and everything is fine... until a future update, I guess. ☹
My computer was turned off for 2 weeks and now that I have turned it back on, the screen is temporarily (about 1 second) going black continuously. I have tried starting in safe mode and uninstalling the display adapter (?) as recommended on the Microsoft support page. Windows 10, Acer Aspire computer 2015 Please keep it simple! Thanks

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