A few weeks ago the retailer send back my defective hashboard.
They put my hashboard into a different S17+. This caused the miner to not even start hashing on any of the boards.
From what I understand this means that my hashboard cannot work together with hashboards from a different S17+.
I didn't know these S17+ had the compatibility issues, I encountered the same issue with the S9k, there are about 4 types hashboards, labeled as 1,2,3,4, so you only have a 25% chance of compatibility between different miners, which SUCKS.
Anyway, I am with favebook on this one, go with the 3/3 used, there is NO guarantee whatsoever that the NEW miner will mine any longer than the used one, i'l take the extra 20terahash with no questions asked.
I will revert back once I change PSU if anyone is interested.
I am interested, please update.