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After install some packages, I don't have sound! I installed Rosegarden, VMPK (piano software), Drumstick Virtual Piano and TiMidity. At the beginning, all works fine, but when I reset my PC, I don't listen anything.

I would like how can I reinstall Alsa. I want to have it completely new, all the settings by default, for example when Ubuntu is installed.

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up vote 3 down vote accepted

Have you already visited official Ubuntu Sound troubleshoot page?

You may want to check default sound output device in your system, as new packages could add new devices and set them as primary/default.

Second, check whether your primary channel is not muted, for example with alsamixer console utility.

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Thank you very much! It's a valuable information. –  Brallan Aguilar Nov 19 '11 at 7:38
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