Constantly resetting PMU, now a dead MAC

This has been an ongoing problem with my G4. I am always having to reset the PMU whenever the unit loses power or was unplugged from UPS -which worked and got it going again. Now it's not responding at all. No sound, no lights, nothing, dead. Per an earlier posting I replaced the battery but now it's not responding at all. Because I was always having to reset it, is the PMU corrupt to the point where it has to be replaced? Do I replace the logic board too? Does anyone have any other suggestions? My G4 is approximately 6 years old (ancient, I know)
G4   Mac OS X (10.2.x)  

Thanks for the response! I will check the power supply, I should mention that when I insert the power cord into the unit I do see a little flash of current through the plug end, however when I press the power button it remains 'dead', no lights, no sound nothing. Will check the power supply though. Thanks again, this forum has really been a great help!!

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