not a monitor but mine was a sony trinitron tv, adjustsing the psu (voltage was low)
the trimmer I was adjusting fell apart as it was turning, the result was psu went to max output 230v instead of 120, flyback obviously stepped up by a similar scale all I saw was a blue flash and then I was on my back 15 feet away from the set.
3 weeks later the screen still had 3 dots on the screen, when i finally got around to looking at the set again it needed a new trimmer and lopt and it came back up good as new (sony used to build decent tvs)