No sound on speakers internal on mac 21 inches

version is 10.10.5 mac 21 no inches no sound from internal speakers, but I can only hear the chime when the opening mac working on the yosemite system I checked in the system pref for speakers, there is none listed it the checkmark is mute and not changing its greyed out, please notify

1. connect 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.

2 reset the PRAM.   http://support.Apple.com/kb/PH18761

3 reset the SMC.   https://support.Apple.com/en-us/HT201295

Tags: Mac OS & System Software

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