If you use an external display with your Mac notebook, you can also use closed-display mode.

On the webpage that appears, the number of displays your Mac supports appears under Video Support.

Then, use Mission Control to organize apps and windows across your displays.

If your Dock is on the bottom of your screen, it appears on any of your displays when you move your pointer to the bottom edge of your display.

You can also change your primary display, which is where your desktop icons and app windows first appear.

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If an AirPlay passcode appears on your TV screen, enter the passcode on your Mac.

Any ideas After all the videos I have watched when I click mirror display it should work.

Your main screen would be the one where you have the Dock and Menu bar.

If all else fails you can try a Mini DisplayPort to VGA adapter if your TV has a VGA input (usually called PC) on HDTVs.

You wont have audio from the TV but youll still get full resolution.

Without knowing your specific model of MBP you probably arent getting audio anyway through the HDMI adapter.

Tell us what you are seeing in the Display preference pane in System Preferences.

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Mirror For Samsung Tv Mac Not Working