If you pick up the MIMIC Beta handlebar and the pan isn't responding, it isn't fully booted. The Pan is the last axis to boot up as the system initializes. If the MIMIC Beta handlebar is moving while the system is initializing, it will take longer for the pan to respond.
We recommend leaving the MIMIC Beta sitting on a table, or across the top of the balancing stand while it is initializing. This will ensure the fastest possible boot up.