Power Mac G4 questions.

So like so many other users, my Power Mac G4 tower will not power on.
All that happens when I press the power button is the indicator light will flash in the blink of an eye.
When I hold the power butoon, same thing, but there is a faint clicking sound comeing from inside the case.
I'm pretty sure it might be the power supply that is out, so how would I know what specific item I will need to buy to replace the bad one?
Also, would it be recommended to get a new battery for it too since it is well over 5 years old?
If none of you can answer my questions, will Geek Squad (no Apple store for quite a ways) be able o point me in the right direction?
How much will they charge me just to look at it, without any repairs?
-Thank you for your time.

What model G4?
A weak/discharged PRAM battery can cause the no start up. Check this site for battery part numbers and sources. https://sites.google.com/site/macpram/mac-pram-nvram-cuda-pmu-battery-tutorial Mac PRAM, NVRAM, CUDA/PMU & Battery Tutorial
Something to try in the meantime. Resetting the Logic Board
Resetting the logic board can resolve many system problems. Whenever you have a
unit that fails to power up, you should follow this procedure
before replacing any modules.
1 Unplug the computer.
2 Press the Power On button on the front of the unit.
3 Open the side access panel.
4 Remove the battery from the logic board.
5 Wait at least 10 minutes before replacing the battery.
6 Make sure the battery is installed in the correct +/-
direction.
7 Reassemble the computer and test the unit.
Note:
This procedure resets the computer’s PRAM. Be sure to
check the computer’s time/date and other system parameter settings
 Cheers, Tom

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