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[Trophy1200]

Originally Posted by CoachKD

The Monoprice system has 4 HDMI outputs with 3 of the outputs filled to our three TVs. I have unplugged, powered off? Switched on and off and still nothing. There is no green/red button behind any of the TVS. Everything worked fine before I changed the batteries out.

Those are the supplies for routing your DVD/Roku or other inputs to your TVs.
The OTA and cable signals are fed through coax cables.

Look at where that box plugs into the 110V and you may see the coax wall panel that others have referred to. Push the button in and the LED should light green to show you are connected for OTA signal, press again and the LED goes out for cable feed.