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オリジナル投稿者: Aida Azin ,

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I followed the instruction of Abin Jo Abraham.

=== I held down '''CONTROL + OPTION + POWER'''. After it restarted the internal speakers showed up again in my system preferences. ===

The Apple Support page also suggests an SMC RESET. If you want more details on this just follow the link

https://support.apple.com/en-au/HT201295

“Resetting the system management controller (SMC) can resolve certain issues related to power, battery and other features.”

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