Thanks for the advice, I switched fan connections and one fan shows in a different slot.  Can an s7 fan be used inin an s9 or do I need a new one?  I assume they are not compatible but thought I would ask.

Hello all,
Just got an s9, boots well but does not hash (all 3 hash boards read 0's on the status page). I notice only one fan seems to be detected. Although both are spinning, there is only 1fan slot reading rpm. All other fan slots are at 0. Is there a way to determine if it is a problem with the fan or control board?