If you have cycled through all the inputs without success then either the TV is bad or the input device is causing an issue. Oftentimes programming is delivered via a subscriber device, dvd player, or other independent player/source. If you have a service like Comcast then they typically will help with troubleshooting. It may sound silly, but be sure to check things are plugged in and turned on. Also, if you are using a strip cord to plug things into make sure the reset switch isn't tripped.