Just checked the output of a B&W's 'front panel' component. While running and tapping just at the connector's interface to the MB one B&W showed 23.1v. That's probably enought to start up a Gigabit/quicksilver class MB.I have no idea what sort of current it can produce, but I'd question if it would run an ADC monitor.
Many ATX PSes have a 4 pin connector dumping 12v which looks like it would fit the P4 connector on these MBs as well.
Some newer ATX PSes even have a 24pin connector which would fit the socket, though some tedious rewiring would need to be done.
You will need to change 4 wires If memory serves, the schematic is at xlr8yourmac.com. You can use an ATX on a B&W and a 100 MHZ G4 but not the 133 MHZ machines, they need more power.
I am researching the B&W power specs for my own project. The front panel does indeed output 24v. Its to power the firewire bus. However this board is only rated at 15 watts, the smallest 15" ADC panel draws 50, So it may allow the Gigabit/Digital Audio boards to power up but will not be safe to power an entire display. http://www.XLR8yourmac.com has detailed guides to converting ATX power supplies to run many G3 & G4 systems Here is the B&W guide:
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