I have upgraded to Ubuntu 14.04LTS from 13.10. Before upgrade sound was working fine, but after that its not working. I tried solving this issue from a reference link
but still my problem is not resolved.
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Could you apply this procedure let us know if you see any error message. Pulseaudio Log
Don't paste your log file in this site but use this one Paste Bin and share the link.
Sometimes uninstall pulseaudio and resintall it solve the problem
sudo apt-get remove –purge pulseaudio gstreamer* esound*
I put Esound package for be sure unisntalled because it's obsolete and occur bug (never mind). Following a reboot apply:
sudo apt-get install pulseaudio
Add you login in the audio group:
sudo adduser $USER audio