Hi,
I assume it's fine as I've turned on machines before without connectors in place, but I'm trying to solve an issue with an EM not turning on and I'd rather work without the head on because of the space I'm working in, and because I'd rather put the head back on once the machine is in the location I plan to play it at. Will any damage occur? It's just a Williams Blue chip that's been in storage for a while. I assume it's the fuses but I want to make sure before I move it into my home.