Macbook pro no audio on internal speakers or headphones

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I am using a 15-inch 2016 Macbook Pro (2.6 GHz i7, 512 GB storage, and 16 GB RAM) running on macOS High Sierra 10.13.6 (latest version). There is NO red light illuminated inside the head phone jack.

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Only headphones show up in the sound preferences menu, and internal speakers DO NOT show up at all. Sound can be heard through headphones connected to the headphone jack. My Macbook Pro is not outputting any sound to the internal speakers, including system sounds like the charging sound, when nothing is connected to the headphone jack.

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