Sound from internal speakers past (iMac 21.5 mid-2011, Yosemite 10.10.5)

Last week, exactly after I unplugged my headphones, the sound from the internal speakers went and I don't understand how to solve this problem, please help.

Sound still works when I connect my headset (or other device) to the audio output.

Sound still works when I connect to my USB external sound card.

Internal speakers still work (I can hear the start-up tone when I turn on the machine).

In preferences / system I see "Digital output" instead of "internal speaker".

Volume buttons do not work,

Audio output leddoes not light.

I tried:

-Reset the PRAM,

-SMC reset,

-' sudo killall coreaudiod ".

-repair disk permission

screenshot:

Plug and remove the headphones.

If you see the red light in the headphone port, plug the headphones

in and o ut of time port 5 or 6 to swing the microphone inside.

Audio output can be blocked using digital technology.

Tags: Mac OS & System Software

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