At 5:58 AM -0400 10/6/2009, Lawrence David Eden wrote:
>[400-MHz] iMac G3 with 1 GB RAM running 10.4.11

Nice iMac.

>The Mac takes a long time to get rid of the spinning circle....then
>appears to load the OS.

The spinning gear is part of the OS load - first it sniffs up the 
machines configuration, then it loads Darwin (the Unix underbelly) 
and the kernel extensions.  That splash screen and its progress bar 
is the rest of the OS loading, Aqua, and the service daemons starting 
- all the stuff that make OS X smell like OS X.

>However, before the task is completed and I can see the desktop, the 
>Mac stops, leaving me with a blue screen.

Do you have AppleJack installed?  If you do, then boot into Single 
User Mode (cmd-S held down) and run it.

Otherwise, as Kris suggested, boot into Safe Mode (shift key held down).

>It won't finish booting....I fear that the HD is a little long in the
>tooth as suggested by one of our colleagues on the List.
>Interestingly, it was working fine until I updated JAVA via Software Update.

Then it's doubtful your problem is hardware.  Mostly likely the 
system caches are corrupted; typical after Software Update these 
days.  Booting into Safe Mode will force a cache rebuild.  Hopefully 
that will fix things.

- Dan.
-- 
- Psychoceramic Emeritus; South Jersey, USA, Earth.

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