Hi. I had Ubuntu Mate running perfectly on my Raspberry Pi 4 (4Gb) for about two days. Then, I left it running for about half an hour as I did something else. Upon return, my screen was just bright green...no icons, nothing. Nothing worked. There appeared to be no method of escape. So, I pulled the plug out .....probably a big mistake. Now, when I try to boot, I get a screen divided in half, white at the top, pink at the bottom.
Top left shows a raspberry, then says, " Install an OS on this Raspberry Pi. Press and hold shift to stop and start a net install."
Bottom, in pink says, "progress: Trying to boot model USB-MSD
Bottom says esc to cancel and go to diagnostic screen.
I asp tried reformatting the SD card but that didn't work.
I've broken it haven't I.