JohnnyKuch,
Since you have other test systems, it sounds like the problem is isolated to that one particular chassis. I wonder if it is isolated to that chassis and that one particular PXI-2565. Have you tried other modules in slot 2 of that chassis? Do other PXI modules work? Do other 2565s work? It sounds to me like everything is isolated to that one chassis at slot 2 and there is no relation to the board, but we need to verify that.
Best Regards,
Jeremy R.
National Instruments - Applications Engineer