My PowerMac G3 300MHz 512MB restarted automatically after shut down

The only way to turn off my G3 now is to switch off the mains. The problem still persists after clean install of the OS to 10.2.8. Also the shut-down key on top right hand corner of the keyboard no longer works. Is there a bug hidden somewhere in my desktop?

I'm thinking some hardware is causing this, do you have any PCI cards or USB/Firewire devices connected?
How to reset the SMU/PMU on a Power Mac earlier G3, G4, G5 models...
http://support.apple.com/kb/HT1939
Oh, after turning off the mains, does it startup by itself again when turning on the mains?

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