Thanks everyone!
I tried all of your solutions, (typing reset and pressing the “enter” button, the alt and R buttons, holding down the slider for '''many''' seconds, etc…), and it looked like nothing was helping. It drained the battery, however, which was fully charged to begin with. When I plugged it in to start charging , it rebooted , and now it works!
I don’t know exactly what helped, but something did.
So whoever is reading this - don’t give up, even if it looks like the end… (This could actually be a lesson for life. Lol).