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Three other findings - isolating the ADC connector of the gpu still lets the G4 bootup (and show video on DVI/VGA of the Radeon 9000 Pro) with the original PSU; so, the card doesn't need 25V to finish its start sequence - switching to an ATX power supply (tried a second one with 1000W) however...

Follow up: I used a step-up converter to create 25V ADC would need, but that didn't solve the boot problem with the ATI Radeon 9000 Pro. Unfortunately I only had an oversized EVGA 1300W G2 PSU for this test, so other factors might come into play here (the ATI Radeon doesn't like). Anyone having...

I had the same issue on a G4 MDD with an ATX power supply swap (I could repair the failing original Samsung PSU in the mean-time and all works properly again, but still like to get to the root of this ATX issue). With ATX PSU, the machine powered on with the startup chime, but no video on the...