Set up my new s9 yesterday with three 750w psu`s , one of the psu`s also powers the control board. Everything was running fine until I turned off the machine to tidy up some cables. When I powered it back up I noticed the middle hashing board was not working and the psu powering this board had stopped. I swapped around the psu`s and whichever psu is connected to the middle board it won`t run. Tried a reset to no effect. Its almost as if there`s a short on that board and the psu that is connected to it is shutting down to protect itself. Anyone else had this problem? I prefer to fix it myself rather than returning it to Bitmain.