Lost sound with 11.10

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http://askubuntu.com – I installed Ubuntu some days ago. The sound worked perfectly, but today there was a shortcircuit and I lost the sound. I thought it was the sound card, but I started Windows XP and it worked fine. What should I do? My sound card is an Intel Corporation 82801EB/ER (ICH5/ICH5R) AC'97. Thanks in advance! :) (HowTos)