One tap of the power button on the front of the Net3 Conductor will either turn it on or turn it off. While booting or shutting down the blue power LED will flash. When it's fully booted the blue power LED will be solid, and when it's fully turned off the LED will go dark.
Under no circumstances should power be unplugged from Conductor without properly shutting down. Conductor is a computer and as a result it's file system can be corrupted if improperly shut down. Pushing and holding the power button to turn it off will force it to shut off, but bypasses its shutdown process, and thus should not be done.