G3/400 (early2001) iMac video dark

My sister has an old G3/400 (early 2001) iMac that had the screen go black, so I have been working with it trying to resurrect it and grab the files off of it.
I thought the video was toast, but as I have messed with it, I've found that when powering it down, the video will flash on screen for a second or two before the machine shuts down and I can actually see what is there (if only for a moment) before the machine powers down.
I'm thinking that if the CRT had gone bad, I wouldn't see anything on startup or shutdown, so why do I see a flash of life on shutdown with this machine, and is there a way to bring the video back?
Ideas?

I think that model iMac 400 has a VGA port hidden under a cover plate on the bottom. If it does, then you could connect an external monitor to see if the problem is just the CRT or something more serious like the PAV board. If the external works, then she could continue to use the iMac without problems, or at least have time to recover files.
References:
http://support.apple.com/kb/HT2682
Image showing the cover:
!http://km.support.apple.com/library/APPLE/APPLECAREALLGEOS/HT3000/HT30001.gif!
The panel covering the VGA port is the one just right and below the power cord.

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