PowerMac G4 533 Dead - No Start-Up

My trusty dual-processor 533 PowerMac desktop (running OSX Tiger) died while asleep. It won't start from the power button on the front of the desktop or from the Apple studio display. No light comes on, no chime, nothing. The machine is stone cold dead.
Tried the usual: changed the internal battery, reset the PMU. Also, tried to start without the battery, changed the power supply cable, checked the internal connections. Nothing. Not a flicker of life.
Not sure what to do next. Any suggestions would be gratefully received.

Could be the power supply died. But try *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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