>> I might possibly have been mis-understood. I was referencing the PC computer only. I only shut down the control box if there is an issue or other reason to do so - which is seldom.

If I leave the control box powered, the fan in the spindle runs. I don't want that powered unless I'm using the machine.

I'm curious why you would leave your control box powered if you're not using it? Seems potentially hazardous to those expensive parts.