errr, "out of nowhere"? I thought you said that you needed to tilt the monitor forward just to get the proper picture? I'm pretty sure that isn't normal behaviour.
I had a similiar problem with a monitor I had. the magnets where all screwy, so the entire picture was condensed into a single picture in the middle of the monitor. a very bright picture. I could smack it, and every smack would make the picture get a little bigger and then it would shrink again. I'd have to smak it over and over again until i "inflated" the picture back to fill the screen. Then it would be good for a while.
Short story on that, It didn't end up dying completely, but rather, I got so frustrated and smacked it so hard I caused it to snap off it's swivel base and shoot sparks. woops.