Have you messed around in System Preferences > Sound to see if changing any settings there will fix your problem?
Thank you, but I checked the sound preference panel, and compared with my other Mac,
Lion, laptop and it was all the same details,
But I seem to have fixe d the problem, by turning the computer off, and when I turned on
There was a bunch of updates of some kind, and after I finished installing them the
Sound returned to normal, PS when the sound was off there was not sound coming from the
Headphones either. I wonder if I learned anything from this experience? Besides to be prepared for more problems in the future.
Tanks for your help,
Sam.