How to Disable the Microphone on a MacBook

Click on the Apple icon in the upper left corner of your computer screen.
Click on 'System Preferences'.
Click on 'Sound', which appears in the 'Hardware' category.
Click the 'Input' option at the top of the window.
Click 'Line In'.
Close the 'System Preferences' window by clicking the red button in the upper left corner.
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