I have a MacBook Pro. When I go to system preference, the external speakers option does not appear in the Input tab. Help?

I have a MacBook Pro. When I go to system preferences, the external speakers option does not appear on the input tab and, of course, the external speakers do not work. Help?

When you plug headphones in, or external speakers, where it states "internal speakers", it will rename that "headphones", say. Unless you are running an external sound card.

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