He clearly states  that he can't access the miner's UI , this does not have anything to do with the fan, the fan's port could have been damaged but that is the least of his problems now.

OP , you must know that even if you were to plug in the control board with no fans and no hash boards, you should be able to see the the miner's UI and kernel log, first priority would be to fix the networking issue you got.

this is how you caused the problem


I don't quite understand what do you mean by changing the old plug, do you mean the male (RJ45) or the Female (socket) , I am guessing you have changed the RJ45 image below



and then simply did not secure the wires well enough / messed the colors order so now your network cable is useless,  the first thing you need to do now is change another Ethernet cable in order to be able to log-in to your miner.

forget about the fans, they will spin as soon as they get the power , how they spin and why can only be found out from the Kernel Log, change the network cable, don't make your own, use a working cable.