My HDMI connections aren't working. How do I

Tries unplug and replug the tv back about an hour.Let the tv reset itself back to factory setting.Now go in ur menu go to PICTURE.Go down the menu pick reset,that to reset all the funsctions in the Tuner board.This process should get all the HDMI Hub. working again,not than ur Tuner board have all the HDMI Hub. are shorted and dead.

It's possible you haven't changed the "source" when trying to view from your new JVC Blueray. You need to change source on television to "HDMI" to view from the Blueray or it will stay in what I assume is Component for HDTV or Cable for Digital Cable television.