Paul
Yes, i had exactly the same with my B1, but it was the right board. Hashing was not affected in any way. Just be careful connecting the PCIe connectors. Hold the board with the other hand when disconnecting, I would suggest.
Incidentally, why did you buy on ebay paying 400-500 more when they are available here for less?
I would be interested in having more info on "here", I need to buy another one very soon.
here=Marketplace of btctalk, hardware section
https://bitcointalk.org/index.php?board=75.0
here is one or two
https://bitcointalksearch.org/topic/wts-antminer-s7-batch-4-and-antminer-s7-batch-5-1251378