How to Turn Off the iSight Light on an iMac

Close the iChat, iMovie and Photo Booth applications. If you don't see them open, search for them by typing in 'Photo Booth' (or the other applications) in the Finder at the top right of your screen, then opening the application.
Select 'Photo Booth' (or the other application names) from the menu that appears in the top left of your screen, then click 'Quit Photo Booth.' If you do this for all three applications, you should be able to turn off the iSight light.
Open your System Preferences folder by typing 'System Preferences' in the Finder menu. Select 'System Preferences' from the list of options that appear, then select 'Accounts' and 'Login Items.' View the list of items that are set to open upon Login. If Photo Booth, iMovie or iChat are on the list, deselect them by clicking the arrow next to the item. That may have been causing your iSight light to be on all the time.
Click the 'lock' item in the bottom left of the Accounts pane to save your changes, enter in your Mac username and password to confirm the changes, and click 'OK.' Your camera light should not turn on and be left on now, unless you open Photo Booth, iMovie or iChat.
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How to Execute a File in a MacBook Terminal (5 Steps)

Open Terminal by going to the “Applications” folder, opening “Utilities” and double-clicking on 'Terminal.'
Identify the path for the file you want to run in Terminal. Locate the file in the Finder, highlight it and select “Get Info” from the “File” menu. The path is located under the “General” tab next to “Where.” That path is comprised of a series of folder names separated by a “/” sign. Highlight the path, go to the “Edit” menu and select “Copy.”
Switch to Terminal and type “open” with one space after it.
Paste the path in Terminal by going to the “Edit” menu and selecting “Paste.” The path you copied from the “Get Info” window does not include the actual file. After the last folder of the path, insert a “/” sign and type the exact name of the file or program. Include the file extension. If you are running a program, the extension will be “.app”.
Execute the file by pressing “Return.”
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