i've built the following circuit to short the PS_ON to GND and turn on a PSU.
The problem is that, despite the pull-low resistor or the state of the switch, the MOSFET will always be on.
With this circuit i've also tried to turn on an LED and it was always on, just a little 'less bright when the MOSFET should have been turned off and I thought of a broken part, but the same happens with other IRF540 i have...
Any idea? I can't understand what I'm missing or wrong