Open up your almixer and make sure that all of the buttons are raised up all the way.
I had to add myself to the audio group log out and log back in again.
If you still don't have sound after that open a terminal and type
And hit ENTER. After that the alasamixer will open with a dark background and you'll see all of the columns.
When I did it I went thru each column muted and than unmuted each column and raised each one up; the master, the PCM, the mic and etc.
After that I pressed the ESC key and saw the orginal command I put in the terminal. Just close the terminal and you should have sound.
This video helped me.....it should help you too-