you need to connect all 4 ports with the PCIE-6 pins and then use a paperclip or the switch from Hashra to "start" the psu. Usually there is a switch that Hashra delivers with the Miner that can be plugged into the PSUs respective port and can then be used to start the PSU but a clip will do as well... Give me a minute and I will send you more infos about the PSU "startup" process.