I have an old 1991 monitor downstairs (from some dead company). In 95, the monitor started exhibiting wierd habits. For instance if you turn on the monitor (after it's been shut off for a while), the screen will shake endlessly for about 5 minutes. Once it nears the 5 minute mark, the shaking will slowly die down and eventually comes to a halt.
Then in 96 or 97, some of the color rayguns inside the monitor died. That left my monitor showing everything in the color shade of purple. I still have the monitor plugged into my old AMD K5 200mhz rig (it still displays images fine, it just shakes alot and shows everything in purple.)