I was working normally, had to go for a couple of hours. Left the system on, downloading an ISO in Opera, and a couple of more apps opened. When I came back, a black screen with a big cursor was on the top, blinking... Seems mouse and keyboard responded, as HD reacted typing some keys, yet, screen all black. Had to turn off the computer. I just installed Elementary for the first time in my PC, trying Juno
Any ideas?