Headphone jack not working on brand new late 2012 27" iMac

Just purchased the new late 2012 27" iMac. Have tried 3 pairs of headphones, all work with my iPhone but when plugged into back of iMac, they do not show up in Sound>Output as an option. Only internal speakers and Apple TV.
I have pushed...hard. Not the issue.
Tired changing Audio Midi settings to 32-bit floating. Didn't do anything...
Any thoughts?
Thx

What you did at last?
This is happening to me and I'm very disappointed and frustrated!
Is the first time I tried to use a headphones and the stupid machine doesn't work!
I already reseted PRAM and SMC also updated OS to 10.8.4
Is a HW problem?
Do I have to go to the store and lost ALL the time I already invested in SW install and file moving from my old laptop?
By the way I can see the light when I unplug the heardphones.
Before some help desk robot asks, YES, I tried 3 pair of phones ALL of them work well in my Vostro 3550, Samsung S3 and in my Nexus 7.
Some light here please!

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