Probably a "silly" answer, but do you have a "brightness" control (a physical knob to adjust the level) that could have been turned down to minimum but whose setting is subsequently overridden once Windows has booted?
AMD Radeon Adrenalin release date, new features, compatible graphics cards
8 brilliant character artists speaking at Pictoplasma 2018
iMac Pro release date, UK price & specs
Football : comment regarder la Ligue 1 en direct ?