G4 won't startup but ticking sound in power supply area when plugged in

My G4 had been fine since the HD went bad years ago and was replaced.
Didn't use it much for a while, then would start normally but shut down with no warning after a few minutes. Then after seconds, then power btn would light up but shut down immediately.
Replaced battery and pushed PMU button. (button doesn't seem to react in any way so don't know if pushed properly or not)
Then nothing happens at all when I push the startup button. But I noticed a quiet ticking sound coming from the area of the power supply, and remembered I had heard that noise lately not knowing where it came from (when it's plugged in but not on). It has always been plugged to a APC BACKUPS 500.
Put back old battery and no difference.
I hope the power supply is not dead, probably cost more than a G4 to replace it.
Any clues? Thanks

OK, I found the info I was looking for on the forum, which was:
"Disconnect all external devices/cables/cords except the power cord.
Touch a metal slot cover on the back of the Mac as a static electricity discharge precaution.
Remove the battery.
Reset the PMU, depressing the button for a five-count.
Depress the front power button, again for a five count.
Wait 30 minutes or so to insure the capacitors on the logic board are fully discharged.
Reinsert the battery.
Reconnect the power cord, mouse, keyboard, and monitor and attempt startup."
After doing this, the power button did light up! BUT went out immediately
Same thing several tries.
Also when I plugged it in after the 30 min without battery, there was the ticking sound for a few seconds, but then stopped. Hmm. ?

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