A couple Tuesdays ago I turned on the computer and went to get a nail trimmer - jagged nails this time of year.
Ken started yelling (pretty unusual) and I put together the words computer and fire, so I ran across the main floor (me running even more unusual than Ken yelling). Sure enough there was a flame inside the computer. Ken later described it as a Bunsen burner shooting out at him. I shut the computer off, unplugged it and took it near the door and opened some windows. Then I set this one up and was back in business. Subsequently our computer service person has located and set up a model comparable to what we had.
I learned several things from this: having a backup is good. Taking apart a computer is not hard. Blowing the dust off the inside of the computer prevents a fire. And the best news is we did not lose any files or photos.