alot of times the symbol will be a horseshoe(sp?) shaped magnet with a line diagnally through it. indecating no magnetic distortion, or remove magnetic distortion, same thing lol :P thats the most common symbol that i know of
but most monitors will get the darker spot on them after they get pretty old, 5 years or more usually. my old gateway CRT was great, it lasted me 7 years and then it died oddly. i donno what happened but i'm somewhat convenced that cellphone signals going through the monitor helped it trip on it's last leg rofl. everytime i'm about 2 get a cellphone call and my cells right under or right beside the monitor the screen vibrates for about 1 second and then another second later my phone rings. has this happened 2 any1 else?