Im new to th Mac invironment and run into first problem . I was playing Warcraft and suddenly lost sound. Now I dont have sound at all. In preferences I can not find output device. How can I fix that. Sorry for this stupid question but right now I have no clue. I was using internal speakers. Under "hardware - Audio (built in)" it shows "no built in audio".
Restart of computer didnt help

Thx for your help