Try this:
Using a Terminal="Applications->Accessories->Terminal"
Code:
sudo pulseaudio --kill
rm -r ~/.pulse ~/.asound*
sudo rm /etc/asound.conf
Logout/in.
Next tweak mixer levels.
Alsamixer
Using a Terminal="Applications->Accessories->Terminal"
Press <F6> to select the correct soundcard.
Press <F3> to show playback levels. <F4> selects capture levels [or use <Tab>]
Use the left/right arrow keys to select and up/down arrow keys to change levels. <M> to mute/unmute.
Gnome-alsamixer
Using Alt+F2 run dialog
Use 'Edit -> Sound Card Properties' menu to enable elements.
Soundcard tab to select / adjust levels.
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