Audio output not working

The audio jack in the back of my iMac is not working. This has happened off and on before but it seems to have totally failed now. There is supposed to be a red light visible inside the jack. I believe the digital output is sharing this jack, there is no red light working now also. I am using a USB to M-Audio box to send my sound to my speakers right nw. I am wondering if anyone has has this problem and got it repaired?
Thanks
Gary

Is your iMac still under warranty? Also, before you take it in for repair, have you tried using Apple-made headphones (like the white ear buds) to test your audio jack?
Also, have you tried using another device to plug into the USB slot you are currently trying to use? To see if it works?
I had a similar problem last year, when I purchased an iMac in Feb 2011. After a few months of usage, there was no audio coming through the headphones I plugged into the audio jack, AND I was having issues with USB devices not being recognized when I plugged it into a certain slot.
After numerous FRUSTRATING visits to the Genius bar where the motherboard and audio cable was completely (and needlessly) replaced, it was finally deternined the actual port with the audio and USB ports was misaligned within the iMac metal shell. So after being initially told that I couldn't get a replacement, they gave me a brand new iMac as it was a physical defect that couldn't be fixed.
Since getting the new replacement, I'm now having minor (and strange) issues with audio again. I suspect it's a common and fundamental flaw with the recent iMacs that Apple seriously needs to address.
Good luck with this - taking in an iMac is terribly stressful. Feel free to mention the possible flaw with the misaligned port - hopefully this will save you the trouble of making numerous trips.

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Audio output not working

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