There are at least a few people in the Mudcat who know a lot more about this computer thing than I do, so, here's what I ran into yesterday:

I got an email from a friend, and when I typed my answer, all that showed on the screen was a line of meaningless letters. If I typed a C it showed as y and so on. It would not print the same letter I typed. Finally, I turned the computer off and re booted. Now it's back to normal. Any idea?