Black Screen After watching my tv, at random times, the screen will go very dark and we will only be able to see shadows, When I turn off TV and wait the screen will be normal. It doesn't matter if we are watching tv, playing games or watching DVDs it does it at random times. What do I need to have done?

Ok, this is probably what has happened, you say that you have played games on your tv, well the thing is with HD and Plasma Screen tv's is that when you play Hi-Res games on them the games backdrop will burn itself into the screen, causing the screen to turn dark and not reveal the correct picture it should. People need to learn about this!!!!! Playing games on HD and Plasma tv's will screw up your resolution!!!