I am having the same problem. When I reboot or boot my system (Mac Pro), I get the bright, white and various color bands on the screen. When I tried to use the menu button to turn it off or make adjustments, I can not see the choices to make selections. The only remedy is to unplug the unit from its power and plug it back. Then the results are back to normal. Its happened several times (at least 4) since it was gifted to me in Christmas of 2018. I was able to take a picture of the display in how it shows for reference.
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