[I]f you have an ATX supply with a switch on it (which
seem to be
rarer these days), that would do the trick.
Maybe. The ATX supplies with switches I've seen have the switch in
series with the mains, so it just allows you to hard power-down without
losing ground - it doesn't allow you to manually force the supply to
power up.
Or are you talking about a switch that _does_ override the wiring
harness's "please power on" line? I've never seen one, but that
doesn't mean they don't exist....
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