Here's another problem.
I recently bought a 1 GHz DP QuickSilver for cheap because the seller couldn't get it running. I'm fine with the expenditure because the parts (CPU, video card, superdrive) are worth more than I paid. Still, I'd like to get it running...
I've got a 933 MHz QS G4 CPU that I know works, and I dropped it into the QS for a test. Otherwise, the system is completely empty - no RAM, no drives, no AirPort card, no PCI cards, no AGP card, no USB devices, no FireWire devices, no modem, no nothing. All that's connected to the motherboard is the speaker, front panel board, power supply, 933 MHz CPU, and CPU fan. I have tried this with and without a PRAM battery, as well. Pushing the power button causes this: The power LED comes on very briefly and then goes out. The PSU and case fan spin up briefly, then they shut off on their own. That's it. There's no chime and no diagnostic tone.
So at first I figured it was a faulty PSU. But I don't have another PSU available that I can rewire to a QuickSilver configuration (closest I've got is an MDD PSU wired up for a DA G4 board and missing the extra ~28 V on pin 9). Instead, I tried a DA G4 board w/ G4/466 in the QuickSilver case (after disconnecting pin 9 from the PSU, of course). Starting up from there results in a slightly different set of symptoms. The power LED comes on as long as I'm holding the button, but fades after I let go. The PSU stays powered in this case, but the motherboard doesn't do anything interesting except light up the red LED next to the RAM banks.
Any ideas on this one? Could it still be a bad PSU?
Does the QuickSilver really need a special 28 V line on pin 9, or can I just tap the 28 V trickle on pin 22 for pin 9 as well? If so, I could test this with the MDD PSU. I really don't want to go buy another PSU that I don't need, especially since QS PSUs seem to be fairly expensive.