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If my electronics are all PSU powered but they turn on my PSU, how do I turn my printer on?

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Sort of a dumb questio but I'm a little confused. I want to hook up my PSU to my RAMPS By plugging green into PS_ON, and then I'm gonna cut out D1 and plug a 5V line from my PSU into the electronics (either the VCC next to the reset board or the barrel plug depending on which one if those work)

But anyways, how would I turn it on then? Do I have to pick one or the other?! I just really want my electronics to be able to kill my PSU in case I blow a mosfet and overheat the bed or something. Thanks.

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