My sound card is recognized and I have tried every troubleshooting tactic on https://help.ubuntu.com/community/SoundTroubleshooting and using all the tactics from No sound in Ubuntu except at log in. I just recently reformatted my computer to run only Ubuntu 12.04, before that I was running Windows and Ubuntu 11.10. My sound wasn't working then, and I thought reformatting my hard drive would have helped, but it didn't. Also, the sound works perfectly when I use my headphones or other auxiliary output device, but never when I want to use my computer speakers.
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