You just reminded me of my old 15inch Zenith TV back then, for the thing used to blank out during use, while I found by taking the back off and "nudging" the board on the back of the tube got it to pop back on - though one day "not paying attention" I reached back and touched the wrong thing and boy did I get a charge off of that... This happen a few years later also, this time a HP monitor, hence the display would continuously fold into a line in the middle of the screen, though this time being a "second" around, I wasn't stupid enough touch around in there.