Dead iMac - worth fixing?

[Ryan Stevens]

I have just been given a dead iMac and I want to see if this thing is 
worth fixing.  It's a basic blueberry 350 MHz slot-load unit from 2000. 
 The previous owner got a quote for $300 to replace some board, 
although she didn't know specifically which board it was, and didn't 
include the service quote with the computer.  Since the machine was a 
business expense and now fully depreciated she bought an iBook instead 
of repairing this unit and gave this lump to me.  The main symptom is 
that, when the power button is pressed, the machine appears to start 
(the power light comes on, I hear the startup chime, and the drive 
spools up) but then shuts down a few seconds later.  I never see 
anything on the monitor.  Is this a problem with the main logic board 
or the analog board?  The symptoms don't match anything I've dealt with 
on rev. A-D machines (those have mostly been dead analog boards), so I 
could use some advice here.

On a related note, if it is the main logic board that needs to be 
replaced, is it possible (and relatively easy) to swap in a board from 
a later DV model and get the FireWire connections and extra processor 
speed?  I know that I would have to cut out the opening for the 
external video connector - are there any other modifications that would 
be necessary?

Thanks,
Ryan
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