Play PC signal through my TV? Help!

I've tried using two diffrent TV's now and had no luck. I've also downloaded ATI catalyst control centre. I know how I am supposed to get the TV to be a clone of the monitor. But the ATI control centre cannot find the TV. Anyone got any other suggestions or want to try using remote assistance to find out the problem.
 
Did you restart your computer with the television on and the cable connected to the graphics card?
 
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