Hi Spiegel,
Can you describe what the problem was with the board that led you to "look into it"?
You mentioned that you swapped the cards and still have the same problem. Do you mean that the same card does not work in a different computer, or do you mean that a different card didn't work in the same computer?
If the same card has the same problem on a different computer, you may want to contact National Instruments about getting the board repaired. You can find contact information at: www.ni.com/support
Luke
Applications Engineer
National Instruments