Mac Book Connectivity with TV

I used th Mini DVI-VGA adaptor, connected computer to TV. My desktop picture and the Dock appear on the TV screen, the mouse I see on my TV screen, but when I click on an application (iMOVIE) it does not open. I had to disconnect the computer from the TV in order to click on System Preferences and get to Display, then I once again plugged the computer to the TV, I saw the System Preferences screen, hit Detect Display, and nothing happens, so that didn't help.
Why do I see my desktop and Dock, but cannot click into an application, the computer and TV recognize each other, but just cannot click into an application.....
Suggestions? Thanks!

I used th Mini DVI-VGA adaptor, connected computer to TV. My desktop picture and the Dock appear on the TV screen, the mouse I see on my TV screen, but when I click on an application (iMOVIE) it does not open. I had to disconnect the computer from the TV in order to click on System Preferences and get to Display, then I once again plugged the computer to the TV, I saw the System Preferences screen, hit Detect Display, and nothing happens, so that didn't help.
Why do I see my desktop and Dock, but cannot click into an application, the computer and TV recognize each other, but just cannot click into an application.....
Suggestions? Thanks!

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