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Glad to see this is still being kept up to date, just joined OGxbox, found it due to reddit

I don't think there can be an ALL encompassing version of an Xbox console PSU. It would need to have 3 motherboard power supply connectors: V1.0/1.1, V1.2-1.5 and V1.6. Update: Spoke, well wrote, before I looked at the linked page. It does, it does have 3 connectors/adapters for all versions of the motherboard. Too bad it's in NL shipping to USA $$$ (€€€) more than the PSU itself.

No PowOK is an output from the power supply unit (PSU) that is raised to a logical HIGH level (3.3Vdc) after the output voltage levels have stabilized. You need to tie the Vstb (3.3V standby voltage output) the BROWN, GREY or PURPLE wire of the various v1.0-1.5 PSUs to PowON (White wire except for the v1.2-1.5 Foxlink PSU where it is GREEN). The PSU pinout diagram at the top of this thread is incorrect for the V1.6 Delta PSU's Blue PowOK line. It is at 0V (a logic LOW level) while the console is OFF (STB column). On the console, the System Management Controller (always powered on by the Vstb voltage from the PSU while AC is provided to the console) awaits the user to press the power or eject button. It then drives the PwrON line of the PSU to 3V3 volts (a HIGH logic level). Once the power supply's output levels stabilize, the PSU raises PwrON to a HIGH level sensed by the SMC which then resets the CPU/GPU/MCPX and starts the clock circuitry that runs these chips which make up the core processing power of the console.

great update thankyou