Thanks to all on the list who sent suggestions. I got it going mostly at your promptings! Basically what I found is that the PS is somewhat marginal (I think). Larry Pina suggests bench testing the PS and gives details on how. I found that the +12v was more nearly +10.75v while +5v was OK. Snooping around inside the PS I found a small pot labelled "REGADJ". Tweaking the pot altered the voltages. If I adjusted for a full 12v however, the +5v went to nearly 6v and the machine would not now stay on while I held in the pwr/cmd/cont keys. So I backed off to about 11.5v (and 5.5v). Now the machine will start up and STAY ON after about three tries. Booting proceeds normally after that. A new B2 battery made no difference in any of this behavior. I have a hunch the PS should be replaced as the fixed delta between +5v and +12v seems to have drifted downward on this unit. Anyhow I'm able to get it going and that's what counts for now. Thanks so much
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