Mini DisplayPort to HDMI Adapter Cable not working on MacBook Pro

only showed my background on my tv, didn't recognize actions though. I could see my desktop background but it didn't show what I was seeing on my laptop screen. Help? Do I need an adapter?

It's working perfectly. What you have is an extended desktop.  If you move the mouse cursor off the edge of the MBP's screen you will see it appear on the TV.  Similarly you can drag windows from the MBP's screen to the TV.  At present the MBP's screen is the primary display and shows the menu bar and dock, and the TV is the secondary display.  To change this go into System Preferences -> Displays -> Arrangement.  You will see an image of two screens, a smaller one representing the MBP's display and a larger one representing the external display.  At the top of the smaller screen in the image is a bar, this represents the menu bar at the top of the screen.  Drag it from the smaller screen to the larger screen.  The external display will become the primary display and the menu bar and dock will appear there and any new windows or applications that you open subsequently will appear there too.

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