Hello guys!
As late as I am(about 3 years since the first post :)) ), I found a solution to this same problem.So after cleaning my ps4 pro ,I placed back the power supply ,but didn’t pay attention to the 2 silvery connectors that should fit inside the power supply, each with its own place, and bent one of them down touching the other one.This way the power wasn’t flowing as ps unit was seeing a shortcircuit.So I got both straighten up ,fitted each in its own hole and my PS4 PRO is back in action.Hope this helped !Good luck and Have fun!