No audio coming out of headphone port

Hi I'm wondering if anyone can give me insight as to what's going on with my headphone jack.
Basically, my Klipsch speakers that I had hooked up to the headphone jack on my iMac for the longest time stopped working. So I thought the speakers had a short in it, nope, they work when I hook the mini jack from them up to my iPhone.
So I tried some other headphones in the iMac's port. They don't work either.
The built in speakers in the iMac works but not the headphone jack.
What happens is, I'll hear a fuzzy sound coming out of the headphones or speakers and every so often I'll hear a "pop" out of the speakers while hooked up to the imacs headphone port, but when I actually go to play any media, or just when I know I'm supposed to be hearing sounds, nada.
I also made sure the speakers weren't muted or turned down or the audio settings on the imac.
Now, what's interesting is, the Apple earbuds with the volume controls can adjust the iMacs volume setting while plugged in, but...no audio!
I'm really afraid the part of the audio board that actually outputs audio has to have a short in it.
I'm hoping not, anyone have any thoughts?
Thanks.

Double check your sound output settings in System Preferences. "Line-Out" should be selected when the Klipsch speakers are plugged in to the headphone jack.
If this still doesn't work, schedule a Genius Bar appointment at your local Apple Store. If you purchased AppleCare with your iMac, they'll be able to fix any hardware issue for free.

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