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Sound on Ubuntu stopped working (however on Windows 7 it works).
I just tried ubuntu-bug audio and gave the following output:

You don't seem to have configured PulseAudio to use the card you want output from (Internal Audio - HDA Intel PCH). You can fix that using pavucontrol or the GNOME volume control.

And the output below is when pulseaudio is written on command line

E: [pulseaudio] pid.c: Daemon already running.
E: [pulseaudio] main.c: pa_pid_file_create() failed.

What should I do? Thanks in advance. I have run alsamixer and the card is not muted.

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have you tried running "alsamixer" in console, check if sound is muted in alsamixer – Rajesh Pantula Jan 5 '12 at 14:31
no, it is not muted – seferov Jan 5 '12 at 14:41

From that error message, I'm guessing you need to go to the Volume Menu -> "System Settings..." -> "Output" tab, then select the right hardware device.

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Thanks for the answer. There are two hardwares: Internal Audio Analog Stereo and High Definition Audio Controller Digital Stereo (HDMI). I have also tested the speakers. Neither works. – seferov Jan 6 '12 at 13:36
You probably want "Internal Audio Analog Stereo". BTW: Here are some audio debugging hints: – tumbleweed Jan 6 '12 at 13:40

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