Sound has ceased working [debian]

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http://www.linuxquestions.org – Hi My sound seems to have stopped working but I can't find anything wrong with it. It was working and works under Windows. I thought it might be a permissions problem but my user account was already added to audio and gets nothing through even with volume turned up to full. I have done some diagnostics: # uname -r 2.6.32-5-686 # cat /etc/debian_version 6.0.7 # lspci | grep udio 00:08.0 Audio device: nVidia Corporation MCP79 High Definition Audio (rev b1) # lshw -class multimedia *-multimedia description: Audio device product: MCP79 High Definition Audio (HowTos)