I can't connect my mac to my TV, I have the right cables and have done it right but I still doesn't get the macscreen on the Tv, what should I do?

I can't connect my mac to my TV, I have the right cables and have done it right but I still doesn't get the macscreen on the Tv, what should I do?

What are you getting on the TV?  Are you getting a completely blank screen, or are you getting a message similar to 'no input detected'?  Or are you seeing the spiral galaxy desktop?  If you go into System Preferences -> Displays then do you have an 'Arrangements' tab?

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