I'm a little confused by your wording.
Did you try each board one at a time to determine which one is not working?
Did you try each data port with that board to determine it is the board and not the port it is plugged into?
Did you try using a different cable to determine if it is the cable?
If you have determined that after the above it is the board and you are still under warranty then you should be able to get it repaired. You could also possibly get it repaired if not under warranty, but it will cost you.