Constant 5V power (1 reply)

I am trying to modify my marlin config file to remotely be able to turn on my 3d printer. The problem is that because I use a computer power supply, I have to activate it separately by connecting two wires. I would like to use a transistor to be able to turn it on from the console if my printer is connected. While I can work out the circuitry later, what I need is a 5 volt power that I can toggle on so it can activate my power supply.

Is there any way I can modify the marlin file to be able to provide this type of customization?