I'm going to guess that your on the as supplied with the Dx6i 'AR6200' receiver - if so, what are the lights on your receiver doing when you switch the plane on?, no lights, no power, flashing, no bind, solid, power and bound.
Also, any chance you changed models on your TX settings? (like if you had a Sim setup and forgot to switch back to the plane in question - done that myself - nothing works!)