Monitor scrolls colors

We have a Dell flat screen monitor that has never given us a problem and continues to function just fine with one exception.
When the computer is booting up or when it has been shut down, before the power switch is turned off, the monitor continues to scroll one page after another one color page at a time red, yellow, blue, green etc.  It will continue to scroll until the power switch is turned off.
We had a temporary (as in 1 second) power outage in the entire town about 2 weeks ago. We didn't  even have to turn the computer back on it was that brief.  Since that day, we've had the scrolling colors as listed above.
Does this harm the monitor and if so, how do we fix it?

Hello comp101. I would unplug the power cord of the monitor, hold down the power button on the monitor for 10 seconds, then plug the power cord into a different electrical outlet. Please ensure this outlet is a direct wall outlet. Reconnect it to the computer and see if it does the same thing. It is very possible the temporary power outage had an effect on the monitor's performance.
If this does not resolve the issue, please respond with the name of the computer, and I will see what other troubleshooting can be attempted. I'm only here to help!
Mario
I worked on behalf of HP.

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