My brother has an HP w19b monitor that has been gettg a luminosity adjustment box popping up randomly. Will stay on for awhile then go away briefly and come back again. Then goes away and may not do it again for a day or two. He also cannot get into monitor menu anymore by pressing the button. Tried unplugging monitor and holding power button in for 30-60 seconds as seen on a forum but that didn't work. Any suggestions?
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