can you so a hard reset, according to samsung there should be a toggle on the back of the tv on the right hand side might be different for your model hit that then on the remote in quick order hit info menu mute and then power. it should give you the option for a hard reset. That samsungs help whether or not it works I'm unsure off, if you can't fix it that way then your nearest samsung service centre could probably hook it up through service mode possibly reset it that way. But it costs money. If hard resets fail which ever you try phone samsung first and make sure the tv's on and your right beside it