G4 1.42 dualie still won't start after replacing power supply.

This Machine was turning off randomly for about a week when it just stopped working. The power light would go on when pressed, but nothing happens.
Tried plugging into a wall socket instead of power strip. Nothing. Reset PMU. Nothing. Battery is good.
Read though many reports and determined the culprit was the Power Supply. The power supply was replaced with original Apple part. The problem remains. Press the power button and the light goes on, release it and the light goes off. Nothing spins up, no chimes, nothing.
Now I'm reading it may be the power button - someone solved the problem by attaching an older keyboard with a start button. I don't have one to test.
I don't want to keep shooting in the dark on this one.
Thanks for any help.

Hi wagsfx, and a warm welcome to the forums!
Good research so far!
Now I'm reading it may be the power button - someone solved the problem by attaching an older keyboard with a start button. I don't have one to test.
Too bad you're not closer, I have 5 I don't need, because buying 8 was cheaper than buying on on eBay!
Anyway, my suspicion is that if that KB thing works it is the Power Button assembly, but that other things will start going wrong shortly there after.
It's likely not any consolation, but I think the MDDs are the worst G4 ever turned out, I wish I could have my $20+K back from buying, repairing, & upgrading them, since all 3 are now dead as a doornail.
Hang on though, there's many far greater experts here than I, & I hope they can drop in with some better ideas for you!

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G4 1.42 dualie still won't start after replacing power supply.

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