I made an appointment at the Genius Bar at the Apple Store, but couldn't get in until 11:30 am. Weird to feel cut off from everything like that. Luckily, I had my old Mac, which works fine except that the LCD screen is cracked and you can't see about a third of the display. That at least allowed me to get online for a while.
Then I headed off for my appointment. Of course, when the Genius guy hooked my computer up to his network, it found the hard drive immediately, and a quick diagnostic scan of the drive indicated no problems.
So all seemed well, and I shut it down, then started it back up while the guy helped another customer. I thought I'd get into my email and upload the chapters of my old story I'd worked on yesterday as a quick back-up of that work. The computer started up for me as well, so I proceeded to open a web browser and I got this message on the screen, which also froze up. The Genius guy looked at it and said "Oh, that's kernel panic."
"Kernel panic" is basically the fancy term for Blue Screen of Death. Which is not the end of the world, but it concerned the Genius guy and he recommended I leave my computer there for the day so they could run a full diagnostic on it. I went to work after that and grabbed my work computer and that's what I'm on now.
Hope everyone's day is going better than mine!
ETA: I did back up yesterday's work after all. I iz so smart!!