I have not tried another power supply but if have instructions to test if the power supply works and I tried it and it worked but I suspect the problem lies in the 24 pin on the month revised where the power Supply connects to and I have tried everything that you listed except that I don’t have any thermal pasteDid u:
install the two power plugs to the motherboard 24 and 4/8 pin
Install the right amount of risers under the motherboard
Plugged power to the. Video card
Made sure the memory is clicked in
The Ryzen is on the mobo support list
Haven’t heard of that power supply brand have U tried another?
Reseat the heatsink ( clean paste and reapply)