Guys, this is an awfully old thread. I don't see how he has the camera interfaced to the radio, as I see no display.
But other than that, the first thing I'd ask is "Does the radio display LOOK like it powers up and works?" If so, I'd suspect the amp.
If not, I'd look at power to the radio or suspect a failure in the radio.

As to resets, I'd have to go try to research what provisions for resets that one has. My current JVC head is only "reset" by removing all switched and battery power and then removing the removable head and taking the CMOS battery out for a few seconds. But not sure on that model.