Power button lights and fades

I had to power everything down in order for some electrical work to be carried out in my flat.
I did everything in the usual order but when I started up again my Liebert PowerSure gave a red warning light and the power button on the computer lit and faded when I pressed it
I took the Liebert out of the loop and the G4 started up no prob and ran fine.
Next day I plugged the Liebert in (no comp plugged into it) to test it and it seemed OK so I put it back but the situ was the same so I decided to remove it and leave it out for now but this time the G4 power button lit and faded even without the Liebert.
I am thinking I need to reset PMU but just wanted to check if anyone agrees or not
If so can anyone add a link to instructions, I had an easy to follow page from here last time I had to reset (after a power cut, which is why I got the Liebert in the first place)
Also, any recommended implements to use for the reset? – I think I used a pencil last time.

Instructions here. You may also need a new internal memory battery. See Mac PRAM, NVRAM, CUDA/PMU & Battery Tutorial
 Cheers, Tom

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