Used a paper clip and got a HUGE piece of lint out! Reps!
Contributing my own experience, since this thread popped up when I was searching for help. My Atrix 4g headphone jack stopped working completely 2 days ago. I tried 3 different sets of headphones (all confirmed to be working on other devices) to no avail. I even uninstalled some recently updated apps like TuneIn Radio Pro to no avail.
So, after reading this thread and confirming the phone is not recognizing the jack being plugged, I concluded that it is a physical obstruction. With a flashlight I carefully (one eye shut) peeked around the headphone jack hole itself. I could see there was some lint in there at the very bottom. Next I took a hairpin, using pliers, created a tiny "L" at the end of it...ya you know where this is going.... Went fishing at the bottom of the hole and ever so gently removed a STRIP OF LINT!! It was about 1/4 inch long, but guess what? After removal and trying headphones EUREKA, success! The headphones are working as expected.
Just offering this as another root cause for headphone jack not working. Be aware of lint! And don't mess up your phone by fishing too hard in there
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