Question asus z270-p will not start on power switch ,voltage present

Nov 21, 2019
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Hi , i have an asus Z270-P that will not start , i have 3.3 volts at the power pin but shorting it will not start the psu it will start though if i short pin 16 on the atx connector although it goes straight off when the short is removed ..
Does the power button 3.3 v come from the pch ,suggesting a problem with that .
I have no cpu or ram in it not sure if its essential to power the board on or not ... .
 

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