I had the same problem and it was the fans in the back of the unit. You can easily order them and replace them yourself. Look at the back of the unit first to make sure it is one or more of the fans not working. Otherwise it may be a fuse or an overloaded circuit. Hope this helps...!
The same thing happened to my Panasonic. Some say to hold the power button in for 10 seconds to reset it and that usually works. Sometimes it needs to be done a few times. My resolution was to plug it into a different circuit in the house. Obviously there was too many compnents on the same circuit and TVs (good ones), will protect themselves from frying and have to be reset. If the new circuit area is working for you in another adjacent room, just tap off of that one and install an new outlet in the room in which the TV is. Think positive! It's not always the Red Light Death!" Hope this helps!