I have a Panasonic th-42px80u that works great except for one thing, all of the HDMI ports all of sudden stopped working. I went to use my PS3 yesterday and it didn't work. I then tried my DirecTV and that did not work either. They both work fine with the component cables though. I can't think of anything that I did that would have caused the problem and everything else works just fine. Any help would be appreciated.
Try using different HDMI cables, if still not working you will need service and would be a good idea to have the Satelite Box exchanges, most likely due to a power spike through your Sat box on the HDMI cable. If Sat box is not swapped same condition will most likely return.
One of the guys here at work had this happen to his display yesterday. It is a Sony. But anyway try this as it did fix his. Unplug the power cord to the dislay for at least 1 min. Unplug.....not just turn off. He did this and his HDMI started to work again.