Mine boots just fine with the +5VSB (standby power) connector from an ATX supply in place of the +28V (and other neccesary pin remappings as detailed on the frankenmac G4 site). You can't use an ADC monitor or any bus-powered Firewire devices, unless you get a powered Firewire hub. If I end up with anything that needs power on FW, I might try a spare +24V Powerbook PS.

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