I had a similar problem when I first got mine. Mine turned out to be a broken trace on the backside of the board. So if it's nothing obvious, I would pull the board and test the connections with a multi-meter.
Check out Pin-Wiki for the pinout diagrams
http://www.pinwiki.com/wiki/index.php?title=File:WMS_Interconnect_BK2K_GI_Marked.JPG