IMac's headphone jack doesn't respond

I have had external speakers connected to the headphone jack for many months, and recently after a brief power outage at our house, somehow the Mac no longer recognizes the speakers. Restart didn't solve anything…….Red light is not on in the jack.
When I'm in System Preferences…..Sound……under output it is showing Internal Speakers only. When I plugged in my external speakers into the headphone jack, I get a brief message "selected device has no output controls".
In Applications……Utilities…….Audio Midi Setup…….It shows "Built In Output 0 in/2 out" .
I have also check the speakers with my mp3 player and they play fine………also plugged in headphones and same results as with the external speakers.
Any/All help would really be appreciated!!!!!!!!!

Possibly create a new user profile to test if it is a software issue. If it still has problems once tested on another profile it is most likely a hardware fault, and the only option is to take it to Apple. Honestly though it sounds more hardware related due to the power outage impacting it's performance instead of a program. Good luck buddy.

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My headphone jack doesn't output any sound when headphones are plugge in. Instead the sound is played throught the speakers when headphones are plugged in. Any suggestion on what to check or do?
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Let's try reinstalling your sound drivers.
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2012 iMac loud headphone jack buzz

I have recently bought the 2012 21.5 inch 2.7 GHz iMac and everything has been working perfectly up until today.
Whenever i plug something into the audio in socket (Speakers or headphones) as soon as music or any type of sound is produced from the computer, the headphones or speakers make a very load buzzing noise. On speakers it sounds like more of a deep kind of sound, due to the better bass on the speakers, but on earphones it sound like a high pitched buzzing sound.
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After I spoke to Apple care, I had to send mine in for repair to the local apple store. I was under warranty so It was repaired (actually got a replacement TBH) free of charge.
Its, from what I can gather, a loose/faulty connection in the headphone jack. Best ring them up and explain your situation, they are very helpful in fairness to them.

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The headphone jack on my iMac is not working. This happened after the latest O/S software upgrade. My system details are as follows:
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If you are still under warranty and/or have AppleCare, call them. Let them deal w/it.
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Possibly create a new user profile to test if it is a software issue. If it still has problems once tested on another profile it is most likely a hardware fault, and the only option is to take it to Apple. Honestly though it sounds more hardware related due to the power outage impacting it's performance instead of a program. Good luck buddy.

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Use OnyX to clean your system and User cache files. It's free to download. Just click on the "Automation" tab, check the boxes and run it.
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K.
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Hey there Kyleosipad,
I was able to find this nifty Knowledgebase article that gave some insight on how to fix your issue. It looks like an audio setting needs to be adusted:
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If you find a post helpful and it answers your question, please mark it as an "Accepted Solution".! This will help the rest of the Community with similar issues identify the verified solution and benefit from it.

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IMac's headphone jack doesn't respond

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