3 ms·
No, pre-ATX power supplies did have their main and only power switch on the 120V AC side. And when the power switch was on the front of the case, the wires goin
by cesarb 7y ago
No, pre-ATX power supplies did have their main and only power switch on the 120V AC side. And when the power switch was on the front of the case, the wires going to that switch carried the full 120V AC voltage and current.
Turning on the power supply by shorting a pin to the ground (it's not 12V, it's 5V, pulled up to the always-on 5V stand-by rail by the power supply) is an ATX novelty.
- T-hawk 7y agoCan confirm. I shocked myself a few times by bumping into the terminal of the 120V AC wire at the power switch on the front of a case. As long as it's plugged in to the wall, one side of that switch is hot even when the PC is off.
- rootsudo 7y agoYou can manually make it always on by just cutting the switch and splicing the wires together. That's probably what fixed the button - jamming a screwdriver pushed the switch/contacts together.