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    About the CRTs: I think it was possible with older ones. I already had some of mine set to levels where the screen was a pure mess. I always turned off the screen because I was afraid of breaking it. Newer ones just showed the "out of range" error.
    – sinni800
    Commented Jul 22, 2011 at 21:35
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    Donkey's years ago I wrote low-level code controlling the (mono) monitor's electron gun. I was concerned that if I got it wrong the beam scan would be restricted to a tiny spot in the middle of the screen, which could overheat relative to the rest of the glass, and shatter. It never did, but I sweated a bit! Commented Jul 22, 2011 at 23:17
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    On the old gameboy and gameboy color, if you zeroed bit 7 of FF40 (LCD Enable) in any period except a vblank it would permanently break the gameboy's lcd screen. Commented Aug 10, 2011 at 21:57
  • This was an issue in the mid/late 90s when configuring X on a linux machine with certain combinations of video cards and monitors and outputting a specific resolutions/color depths/frequency updates.
    – ivanivan
    Commented Sep 13, 2017 at 14:21