If you're running Windows Vista. 7, or 8, then with a YouTube video playing, right-click the volume icon (bottom-right near the clock) and choose "Open Volume Mixer". Make sure that the levels for your browser and Adobe Flash (if listed) aren't too low.
If you've already tried that then please post the links for those forums you exhausted to prevent anyone's time being wasted by repeating stuff you've already tried.
No, all volume sliders are at max or less if I set them lower, still no audio,
Have set youtube quality to highest, lowest and everywhere inbetween, with no result.
I'm going to run fixit again, it did give some registration corruption which it fixed when I ran it.
Sorry secret squirrel, I don't like linking different usernames together on forums, easy meat for internet trolls, hope you understand, and don't for a 2nd think I mean you but some folks get a kick out of pasting links to totally unrelated threads. (Hope I've explained that correctly).
I had a similar problem with youtube using Google Chrome. There are any number of comments concerning this on various forums. In the end rather than wasting time I now use IE for youtube and have no problem so perhaps worth checking if it is browser related.[/QUOTE]
Thanks, yes I got a similar reply in my own search, but I am already using IE as my default browser.
The interesting thing here is that this problem has cropped up over about 4 or 5 years and there doesn't appear to be a common fix.
I have today shut down and removed in 1 case all my security and tried after each change, No difference so now all reinstated.