I have (had) a Discord bot living on my Raspbery Pi 3 B+, and all was well for about a week. Then the bot crashed mysteriously (and the Pi stopped responding to SSH). I plugged the Pi into a monitor and poked around the filesystem a bit and everything seemed normal, but when I went to dig into raspi-config to see if anything looked funny it showed an empty blue screen instead of the settings dialog and stopped responding to input altogether. No command line, no "quit" command, no nothing.
I've seen a few fixes on the Internet for ssh/WiFi not working, but testing them sort of relies on the Pi being functional so my main concern is the blank screen and apparent crash. I'm reluctant to pull the plug and start it up again because I know that can brick the OS but I'm suspecting the damage might already be done.
(Googling around suggested the Pi might not be getting enough power, but I'm using the power supply from the official web site so I'm doubtful that that's the issue.)
edit: turned if off and turned it on again to see what's probably some SD card corruption (see comment thread) so this likely can't be fixed in this go-round, but if/when it happens again I'd like to know what I can do about it . . .