How to reset PMU in Digital Audio G4?

Are there any procedures required other than powering down, disconnecting all leads, opening the case and pressing the PMU button (located on mobo with "S1" marked next to it ) ??
I can not find any tech articles on resetting the PMU on a Digital Audio G4 Power Mac despite doing numerous searches.
Thanks

Hello Murray and Thomas,
On my dual HD, dual boot DA, I had a similar problem following an unsuccessful attempt to install a flashed PC Geforce 3 video card.
Wouldn't boot in OSX at all, would boot in OS9 only if I unplugged the OSX(10.3) HD and set the startup disk from the OS9 install CD.
Reset the pmu, no help; repaired permissions, no help; ran disk first aid - DFA said fine; ran Disk Warrior - DW said fine; I could see all drives - I just couldn't boot. All I got was the Apple prohibitory sign - the "No Parking" sign.
Solution was tu reinstall OSX. Install went smoothly and have had no problems since.
HTH ..... Jon

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How to reset PMU in Digital Audio G4?

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