[ubuntu] Headphone jack stopped working

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http://ubuntuforums.org – Hi there, I am running Ubuntu 12.04 and this morning when I tried to use Skype the headphones didn't have sound. I tried my speakers and also no sound. However, the built in speakers of the laptop work. but cuit out once a jack is connected. It reckognises the headphones or the speakers, but no sound. And yes, the volume is up. Any ideas. I think my skype updated too, but the problem malso persists for Banshee and other sound related programs Greetz Acradon (Hardware)