G4 won't start unless from a restart or pmu reset

my G4 won't start unless from a restart or, if the computer has been shut down, I have to reset the pmu - with inside button or by removing battery.
Can anyone think of why this happens? What goes on with a shut down that doesn't with a restart? With the problem, nothing happens after the chime and I must hard shut-down, unplug and reset pmu, then it's fine.
Thanks for any thoughts or suggestions.
Henry

well, I can't find anything wrong with it. maybe my logic board is shot. i guess i'll take it in to tek serve or an apple store and see if they can figure it out.
thanks for the suggestions, tom.
henry

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