Stuck on channel and no response to remote or tv...

Question

while browsing through channels the TV stopped on a channel and then stopped responding to both the remote and the buttons on the TV. The only button it will respond to is the on/off. I cannot change channels, volume, source or access the menu. I have unplugged it, used the on/off switch on the back and nothing works. When turned on it does display the channel information and there is sound.Any advice you can offer me would be wonderful.