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.
My sympathies. I remember the feeling in my gut I got when I had to manipulate XFree86 (what distros shipped with when I had to do this the last time) and worrying that I'd lose my one and only monitor, but it never happened to me.