A previous reply didn't get posted. Thanks Kris for the correct procedure 
for resetting the motherboard. I'd removed battery and AC cord  and waited 
before pressing the CUDA, but hadn't removed the VRM.
   As for the power supply, I was following the Troubleshooting 
instructions in the service manual, but had not understood the pinout 
diagram. I read it as plug layout and and got no 5v trickle there; on 
MacForums it is suggested that the diagram is actually the pin layout on 
the motherboard and orientation would be reversed on the plug from the 
diagram. 
  Somehow the problem had shifted from no boot to no shutdown without 
reboot. I began to wonder if the problem was coming from the ADB and the 
keyboard start button. Changed keyboard with ssame problem, but when I took 
the AppleVision 1710 display and its ADB connection away, all was good.

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