thanks for the replay curt.
i started the barco up with the tray under the lenses removed but the error was still the same.
you are right it could be a bunch of cards (every card on the i2c bus).
I still have another working barco data 800, so i can swap the cards one by one but i'm afraid that the broken barco will kill a working card from my good barco.
If one day i start swapping cards and i locate the broken card then i will give your $10 cards a thought