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does a standard PC power supply out put all need voltages when turned on/plugged in ?
or do they also have a power up sequence where a signal from the mother board
is needed before all the voltages supply power out at the power supply ?
I am trying to understand if no power or reduced power ie my 3.0v on the 3.3v line out of the PS
is standard/normal along with no 5v power on a plugged in PS befores it get a signal from the mother board to go to full power in a power up sequence
as one rude and crude fix I could see is just wiring an PC 250w PS to the apple 14 pin power supply out plug for a $20 repair avoiding the apple tax $150 new unit price with a hole thru the back of the imac for the wires ether to test the imac to see if the MB is good or as a cheap lasting solution
but stupid me thought if you plug in a PS
it should out put the needed volts on the pins/lines
even if not hooked up to a MB ?
and with out no volts on some pins that later power up in a power up sequence
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