I am not familiar with the half moon, but most laptops allow you to hold down the function key (Fn) and tap either the F5 or F6 key and switch the output of the LCD from the screen out the D-shell RGB connector to a cable connected to another monitor such as your TV screen or a stand alone. I say F5 or F6 as it is different on different machines. Ordinarily if you hold down the Fn key and re-tap the half moon key it should reverse what your wife has done. The keys act as a toggle on then off.
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