I have recently been messing around with a second monitor and the system's display settings and now, every time I try to boot up, the screen goes completely black (not even a mouse cursor) right after Windows 10 finishes booting. All the guides I've read only explain how to access the advanced boot options menu once booted up, therefore rendering themselves useless to me.
As a side question: how do I change my display settings without booting Windows? What I did was add a second monitor and chose to extend the screen to it right before accidentally turning my PC off with the power button.