Is my monitor really broken?

I recently acquired a Sun GDM-90w10 (rebadged Sony w900) 24" widescreen
crt. It is very old (manufactured Dec '97), but it was in remarkably
good condition and worked beautifully.

Tonight I returned home and switched it on, to find that while it made
the clicking noises that it usually makes as it starts up, it didn't
come on. Instead of the tube powering up with the typical "bong" noise,
it made an extra click noise, and the green light switched off, to be
replaced by the light next to it blinking orange. This LED has a symbol
that appears to be a crossed out lightbulb.

When I bought the monitor, there were no manuals for it, and the best I
could find on the internet was a <a
href="http://www.sunshack.org/data/sh/2.0/infoserver.central/data/syshbk/Devices/Monitor/MONITOR_Color_24_Premium_CRT.html";>spec
***</a>, so I have been unable to find what this flashing LED means.

I do not believe that there should be anything physically broken in the
monitor, as (to my knowledge) it hasn't been moved since I used it last
week, but I can't be sure.

Did my monitor just meet it's inevitable end and wear out? Can anyone
help? Is all hope lost?

.