I was using my laptop to play Youtube on my TV. I had no problems. It was going through my HDMI and I was using the cable to play sound through the TV. I disconnected the cable and since then there is no sound.
The sound card is working because I get the welcome tone when I get my password screen.
I have tried to use Firefox and Chrome and nothing. I have restarted and rebooted and nothing.
I have checked my sound settings and they are all ok.
Ubuntu version 14.04 LTS. Latest versions of Firefox and Chrome.
If you need any other info please ask.
UPDATE - not working on VLC media player either...