So sound is not playing on any application.

You may want to try a windows based forum if that is the situation.

• http://support.microsoft.com/

Hello crumpet,

do you can play music with Media Player / winamp or something else that you can hear? Is it just a problem of the browser or of your computer? Do you use Windows or Mac? Please write us further to find a solution. If you don´t hear anything at Media Player /winamp it could be a problem of your music boxes.

Check that your audio settings on the computer are turned on and the volume is up. Control Panel > Hardware and Sound.

See also:

• https://support.mozilla.org/kb/fix-common-audio-and-video-issues
• http://kb.mozillazine.org/Video_or_audio_does_not_play