My friend who was given his first computer by a friend asked me to see why he wasn't getting any sound from it. I had a look and I can get sound from media player/radio and from inserting a CD but nothing else. No window sounds and no sound from sites like you tube and flash videos. I have checked device manager and a few other things and made sure flash player is installed. I have looked at the sound/audio in my computer but nothing seems wrong. Any ideas what I can look at next for him please as I am now out of ideas Thanks for any help.