I have a slightly older Lenovo laptop (about 4 years old) that is running Windows 10. When I went to shut down last night there was a long update that initiated. When I woke up this morning the screen was black with the mouse cursor and the spinning dots that indicate Windows is "thinking". Since it had been doing the update for almost 10 hours, I figured it was stuck, so I manually turned it off. When I turned it back on I got the Windows logo, followed by the same black screen with the mouse cursor and spinning dots. Please help me understand what this means and what I can do about it.