AFAIK, the SG II is powered by the OBDII port it is plugged on to. Make sure you have it connected securely. If so, crank the engine. If the engine is running and the SG still doesn't read the data from the OBD, check to see if the "phone jack" end of the cable is securely plugged into its connection port. Try the other one too. Also, if the unit is "asleep", according to the manual you can wake it up by pressing the "home" button, the one with the red circle
Maybe OEMY will see this, or you could send him a PM.
2016 EC Aspire 42RBQ / 2014 CR-V