A power and reset button for your PC that you can set on your desktop
Print a 2 keys 3d model like this great one https://www.thingiverse.com/thing:2964514 from https://www.thingiverse.com/DesignedBySodaMan/about
Solder the keys to a diode (not sure if that’s mandatory) then to a pair of wire.
I used an old network cable, containing 4 twisted pairs.
Connect inside your PC, on the power and / or reset switch.
Pressing the key will power up or down your PC.