The strange thing is that I tested more and when I disconnect the cable from the card in slot 1 everything works as it should on the right monitor.
As soon as I connect the cable again the preview switches to the other monitor and it stays black again.
In the previous setup with the 3870 in slot 1 everything worked flawless with two cards.
It seems however that the main card has to be in slot 1.
Seems the only solution if it can’t be solved in software is to find another way to mount the new cooler so the 3870 can be back in slot 1.
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