27 inch mac lost internal speaker output, 27 inch mac lost internal speaker output

Hi There
Has anyone had this problem
27 inch mac lost internal speaker output. Shows a selection for external speakers but not for the internal speaker.The internal speaker work as the Computer makes the normnal nosie that it makes on start up. I can plug external speaker in , and they work, but would prefer to use the internal speakers. Software is up to date
Look forward to hearing from you
Many thanks
Sunnypip

Hopefully one of these steps should solve the problem.
System Preference > Sound > Output > Internal Speakers
Make sure Mute is not enabled.
If you see red light in the headphone port, plug the headphone
in and out of the port 5 or 6 times to flip the microswitch inside.
Sound output may be stuck in the digital mode.
Reset PRAM. http://support.apple.com/kb/PH4405
Reset SMC. http://support.apple.com/kb/HT3964
Choose the appropriate method.
Best.

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27 inch mac lost internal speaker output, 27 inch mac lost internal speaker output

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