Err, just out of interest, was the day of death preceded by the occasional 'pop' of the monitor, accompanied by a tempoart deformation of the picture?
I ask becase this seems to be a common problem with this CRT. There are a couple of threads at the Macfixit forums (I think) about the whole syndrome, as well as much discussion at Apple's own boards (that is, if they haven't deleted the threads there because they don't like the sound of it

). There's even talk of a class action lawsuit.
Actually, my own Studio Display CRT has started to make the occasional (like, once every 3 weeks) pop... I like the look of that AppleCare box on my shelf...