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I've got a mac (desktop around 2008). I installed Ubuntu 11.10, then remembered I had 12.04 on a disc. I installed 12.04 and now the audio will not work. I've tried all the killallpulse and looked briefly at the Alsa thing. I put in speakers and they only work with the headphone setting.

When i put in cat /proc/asound/cards
I get:

0 [Intel          ]: HDA-Intel - HDA Intel
                      HDA Intel at 0x50600000 irq 47

I do have the Mac startup noise but no sound in Ubuntu

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