At its core, Win + Shift + B forces Windows to perform a hard reset of the graphics driver stack. When you press it—and you’ll know you’ve done it correctly when the screen goes black for a split second and you hear a distinct beep—the operating system essentially tells the graphics driver, "Stop everything, clear your buffers, and start over." It doesn’t restart the computer, close your applications, or lose your work. Instead, it acts as a targeted reboot for the visual subsystem.
Black Screens: If your monitor is on but showing no image after waking from sleep. windows 11 screen refresh shortcut win+shift+b