My fire TV worked fine when I first installed my setup but when I tried to use it this week, it suddenly would not show picture or sound. I have it plugged into my RZ620 which feeds my Optomo UHD60. It's plugged into the "stream box" input which is HPCP 2.2. The kicker is when I plug it into any other TV I have, works fine. If I plug it into the AUX HDMI input on the RZ620, works fine. Why did it suddenly stop working for the "stream box" input?
I would think it is an Onkyo receiver issue. I have the same receiver and I have had no issues. With the large number of ports on the Onkyo it is really not significant. I would first pull it from the AV and reinsert it into the same port. If that does not work just put it in the Aux port and send an email to Onkyo. Onkyo has been responsive to emails when I have had questions (mine were with their sound bar 7.1 system.(