[ubuntu] sound disppeared

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http://ubuntuforums.org – Hi, I have a laptop with onboard speakers and a headphone jack. If you use the headphone jack the onboard speakers stop. This is good because my onboard speakers are broken so i plug my headphones into the headphone jack and i still have sound :D The problem is. During the process of trying to get my webcam to work I installed ekiga. After this my sound disppeared. I've gone to the sound preferences in ekiga and tried all the different output options but still i have no sound. How to get my sound back and how can I reinstall my networ (Hardware)