Hagen2000, you´re my hero! 
The strange thing is that I use a Beo4 and was reading Teletext. I must somehow pressed [SHIFT] [9] but I don´t know how.
I used my Beolink 1000 to set it back.
Once again, thanks! Without BeoWorld I would have to go to a service center.
Beovision LX5500, BeoCord V6000, BeoSound 9000, BeoLab 8000, BeoLab 3500, BeoLab 2000, BeoVox1, BeoCom 6000, Form1, LightControl 1