A few days ago Ted the Cat knocked my Kindle Fire on the floor (from the kitchen table). It was in a case and nothing was obviously broken, but when I used it the next day, it was dim and the color was off. I could fix it by tweaking settings, re-booting didn't help, so I went back to factory default, and that worked. Although having to set up all the accounts again is annoying. First world problem, I know.