HDMI channel stopped working?

I would try this. Turn off the tv, and then unplug it from the outlet. Wait a couple of minutes. Plug the tv back in and then turn the tv back on. See if the HDMI inputs work now. I am hoping that powering it off will reset the HDMI inputs. If it does not, then you will need to dig into the owner's manual and look for the way to reset your TV back to factory settings. Do a reset and see if that works.