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Is there no sound on any of your inputs? If you don't know, then try hooking up equipment to all of the different inputs. If only some of them don't give sound, then it may just be the input jacks themselves, or even the controllers used to send those signals to the main processors.
If you have absolutely no sound on any channel/input, then the main audio controllers are likely open/shorted/fried, or the main connections are open/shorted/fried.
Yes. Its probably a stuck button on the TV's front panel. Try pushing or wiggling each button on the panel. It could be the channel up/down buttons or volume up/down, menu, etc.
When there is a button that is making slight contact, it keeps the microprocessor busy attending to the command its erroneously receiving from the offending button and may not allow other functions to work when this occurs.
It doesn't matter which button is stuck, any of the symptoms you describe can happen.
What is your TV input connection? Are you using Antenna? Cable? Dish?
The Unusable Signal sounds like the TV is not getting a signal. Does your TV have a built in HD Tuner?
If you are using Antenna you might want to try setting up the connections and it should search for quality channels that you get good signal strength. If you are on channel 2 and there is no over the air channel 2 it may say "unusable signal".
I disconnected the front buttons of my set. Pop off the speaker cover and note which color wires come off the buttons and then take off the lower back and you can see where it connects to a board. Generally the far right connection but trace the wires. After doing that my channels quit cycling and everything but the front buttons work.