Guest DrBobF Posted December 21, 2021 Posted December 21, 2021 Greetings - I'm trouble shooting a 2009 Mac Pro for a no power up problem. The apple custom 980Watt delta power supply pinout is proprietary but the major power rail positions are evident. ( +12/ GND... GND/ +!2 ) The center group of smaller pins have two conductors that when shorted together will power on the PSU, which is, I think, the " power on" signal, normally supplied by the mother board. In the process of load testing the PSU on the bench to check the current spec. Does anyone... Read more Source: MacRumors
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