Panasonic Plasma TH-50PX80U HDMI Inputs Quit Working

I have a Panasonic Plasma HDTV Model # TH-50PX80U and all three HDMI inputs quit working. I have tried multiple HDMI cables and devices and nothing works. All of the other inputs work using the same devices, but not the HDMI. I have reset the tv by unplugging for 10 minutes and also by holding the vol - and menu button, causing the tv to do a system check and then hit the power button causing a reset. Even after the reset, the HDMI inputs do not work. Has anyone had this issue, and if so, where you able to fix it?