Cannot access the apple tv menu, no image on tv
I am having problems setting up my new Apple TV box. I have it wired with HDMI cable via my Samsung surround system to my TV but do not see anything on the TV. The LED lights on the Apple TV unit and responds with a blink when the menu button is pressed on the remote but the TV still just shows 'no signal' I have also tried connecting it the the TV direct but get the same result. Can any one help and tell me what I am doing wrong?
AppleTV 2, Mac OS X (10.7.3)