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Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.Before you condemn the unit as being bad you can try doing a force start of the system. To do the Force start you need the Service Connector 07PAZ-0010100. See the step in the link below.https://dl.dropboxusercontent.com/u/104923897/Nav%20Force%20start%20Mar%2025.pdf
Unfortunately it sounds like the problem is with the unit and its not something I can fix from there. I will open the post back up for you and perhaps someone else may have something different you to to try. If they can help they will respond .