No sound from headphone jack on 2011 imac 27"

I usually use the headphone jack on the back of my iMac to drive studio speakers thru a mixing console. I recently unplugged the cable from that jack to hear something through the internal iMac speakers, which worked fine, and now that I've plugged the cable back in, I can't get the external speakers to work. In System Preferences/Sound/Output, the display vacillates between "Internal speakers" and "headphones" when I jiggle the cable in the headphone jack, which leads me to believe that the output jack has become damaged. That would mean taking it in for replacement, right? Or does Apple throw the baby away with the bathwater and just replace the whole computer, rather than replacing the jack itself?
In any event, does anyone have any ideas for me from what I just posted? Thanks very much.

Hi all again
After reading through a few other posts here I decided to check "System Preferences." After doing this I discovered that when the headphones are plugged in it set to mute. Not sure how that happened, as I nevered changed anything and I am only one using this computer. I guess it does not matter, as long as the problem is fixed.
Thanks
Michael

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Hello JohnBoarkman,
Welcome to the Apple Support Communities!
I understand that you hear no sound from your accessory when you connect to your headphone jack. My first troubleshooting suggestion for this situation would be resetting the NVRAM on your Mac. Please use the instructions in the attached article to complete this process and let me know if the issue continues.
How to Reset NVRAM on your Mac - Apple Support
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Hello JohnBoarkman,
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I understand that you hear no sound from your accessory when you connect to your headphone jack. My first troubleshooting suggestion for this situation would be resetting the NVRAM on your Mac. Please use the instructions in the attached article to complete this process and let me know if the issue continues.
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Hello!
Below is a link to HP Support involving sound issues. Could you go through it and see if it assist you with the issue?
http://h30434.www3.hp.com/t5/Notebook-Recovery/BIOS-UPDATE-crashed-my-computer-HP-ENVY-15/td-p/32270...
If it does not, System Recovery back to original OEM settings is the next best option for you. Sorry.
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I am an HP employee.
Make it easier for other people to find solutions, by marking my answer “Accept as Solution” if it solves your problem.

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Hello ArthurSilva,
Welcome to the HP Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
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Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
Also be sure to mark my post as “Accept as Solution" if you feel my post solved your issue, it will help others who face the same challenge find the same solution.
Dunidar
I work on behalf of HP
Find out a bit more about me by checking out my profile!
"Customers don’t expect you to be perfect. They do expect you to fix things when they go wrong." ~ Donald Porter

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Verizon Wireless Customer Support <[email protected]> wrote:
Verizon Wireless Customer Support Verizon Wireless Customer Support created the discussion
"Re: Droid Razr Maxx- No output from headphone jack"
To view the discussion, visit: https://community.verizonwireless.com/message/1007696#1007696
>

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Have a good day.

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No sound from headphone jack on 2011 imac 27"

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