It just happened overnight. Turned computer off at night, went to bed, turned it on in the morning: no sound!
It was one or two months ago now though. When I try to run itunes it says there is a problem with the audio device.
I download the codecs (I think that's what I'm downloading anyway) and it unpacks them to random folders and usually the sound starts working again. Sometimes the internet sound works with it sometimes it doesn't. Sometimes it is the other way around and only my internet browsers emit sound. But whenever i restart the computer again it stops working. It is REALLY annoying and help would be much appreciated