Bluray only works immediately after DVD is played

  • Heyy there,

    i have the following Problem with DVD playback:

    When i insert a bluray no title is shown and when i press the play disk button nothing happens except for the button sound.

    When i insert a DVD, pause it and then insert a bluray: The Name oft the old DVD gets shown and when i press the play disk button the simplified bluray menu get shown, as it should. Now the bluray plays normaly.

    I cant figure out what the problem is. I would be very happy to hear some ideas of you.^^