And from where exactly are you drawing the TWO +28v lines from in a standard ATX PSU? The single +28v line on the Gig Ethernet/ Digital Audio is hard enough, but you definitely aren't getting two of them from a standard ATX no how. Using wallwarts to supply +28v is messy at best. Are you supposed to use two of them with a Quicksilver motherboard? How convenient is that, having a computer with three power cables instead of one? How easy is it to plug two wallwarts into an a two outlet wall plate or power strip/block at the same time? Rewiring an ATX is probably not something most people would be comfortable with, either.

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The machine doesn't need the full 28v to start according to the modification guide, on most systems with modified PSU's, 16-17v has been found sufficient.

The simple solution is to connect the 12v+ line from the PSU's molex connector to the 5v+ trickle line to generate a total of 17v. Diodes are of course required.

The conversion guide can be found here, along with conversion guides for all sorts of other G4's.

http://atxg4.com/quicksilver.html

The simple diagram for connecting 12v to the 5v trickle line can be found here.

http://atxg4.com/images/Wiring-DiagramQS.jpg

EDIT: Oh damn, I just realised why it may not be working. The diodes I soldered in are around the wrong way... durr! *hits self* I'll rectify the problem and give it another test.

DOUBLE EDIT: It didn't work even with the diodes in the correct order. I think the tower's dead as a doorstop, so project Silvertooth will go ahead provided I can find a Sawtooth logic board.