Im so glad I sold all my S17+ last year. They are all garbage quality, but thats not what you want to hear...

I would carefully try each hashboard one by one in the working miner to see if any hash.  If the ALL hash it is certainly a power supply/controller issue. Buy extra PSUs/controllers for these machines.... If 2/3 hash, the bad board is killing the good ones and not allowing the unit to work. Could also be a controller failure. You could try the good controller with the good hashboards (after testing) and see if that works. Swapping controllers sometimes works.