Whoa, what? I'd be curious to hear more about that... How could some software config harm a display? Incorrect sync rates or something? ...and yeah, I am old enough to have used CRT displays for many years of my life, just never seen one get damaged like that! :)
Used to be, you configured X for your monitor and video card by editing a config file that specified the assorted timings and so forth. Yes, you could make your monitor very unhappy with the wrong settings.