In message , Paul
writes:
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The front button does not have "direct effect".
It's a [partially] software mediated button.
The switch on the back of the PSU, is a
direct effect switch that cuts the mains.

If it's there; not all power supplies _have_ the back panel rocker
switch. (Or have regulations changed and they have to nowadays?)
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the schematic. There's a 4.7K resistor to +5VSB
and there would be 1 milliamp sunk to ground on
the motherboard end of PS_ON# pin 14.
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Or slightly over 1 mA, of course. Isn't it funny that resistors (and
capacitors, and many inductors) are still made to the E12 series, which
dates from when they were sorted into bins as they came out of the
machine that made them, whereas they're usually precision-made to 2% or
even 1% these days!
--
J. P. Gilliver. UMRA: 1960/1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf

aibohphobia, n., The fear of palindromes.