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I have a Samsung 50" plasma that’s all I know it is called. I have brought a desktop in hope to mirror it onto the TV. The computer is registering that my TV is connected but the TV just says no signal. I have tried several hdmi cables. At one point the TV did work for a split second but now won’t. Does anyone have an answer to why this is. I have also tried in all three hdmi connections on the TV.

On your tv there will be a place for source probably on your remote this needs to be set to your input which will be labeled on the back of the tv were you plug in your hdmi. Match up your input to you source and there should be a picture