Hi Ray
Unplug the power cable FROM the ESS, or the USB cable from the USS. Both have connectors, so are easy to disconnect.
Ha! You haven't seen the compact compressed rat's nest the builder made of the electronics on my rig. I am not sure there is a power connector for the ESS: I think it gets power through one of the headers. I didn't build this!
I have to pull the whole electronics crate out of the cupboard and remove a complex cover first. Getting access to the ESS takes about 15-20 minutes. I didn't build this!
Cheers