[ubuntu] Plaback sound stopped after an uninstall on compaq cq50-106au laptop

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http://ubuntuforums.org – I hv installed Amarok on my system some days ago.Now I have uninstalled it.And After a reboot I found that no playback sounds are coming.The log in sounds are coming perfectly and when I check the sound card through terminal,it's fine.But no playback on other ways.Please help guys,I'm in serious trouble. (Hardware)