Thank you Saga Lout. First: the volume control is not set to mute. Everything about the sound is alright. That I can see on the screen when I look in control panel, Sounds en audio Devices under the Hardware tab. My Realtek is showing en the entry is nog greyed out. Everything is showing that there must be sound to hear and still there is no sound. Last year I got another pc and there was the same problem. When there is a change of something of the pc there is something wrong with the soundrendering.