I am having problems when I power on/off my L3 and S9. My bitmain power supply are stop working, luckly I received tripled in my bitmain order and I still replacing them without problems.

The bitmain power supply power on and its fan works but do not power on my L3 or S9. If switch power supply L3 and S9 works fine.

Dunno if doing it right? Is there any protocol? Need I follow some steps in order to power on/off?

Thanks in advanced.