I have bought 19 miners from Bitmain.

However I have spent the last week plus now trying to get a location they want ONE of the miners to be returned to as it has NEVER worked.   They asked me to check all the boards, do my best to work through the problems.

The problems are
out of 10 hash boards in the S2 ALL are damaged or warped badly.
There are diodes missing on 7 of the 10 boards. 
The boards do not line up with the slots in the case.
The miner has never worked today they ask me for screen shots.
The miner has never worked how am I to get them screen shots.
I have already take a miner off line, to test the boards.(I had a 80 mile drive to do that)
They are warped so bad that they do not fit properly into the slots on my other miners.
Also VERY slow response to the emails.  took 4 days to get my first response.

Anyone else having the same problem with Bitmain

Jerry