Time for some basic PC troubleshooting steps. First simplify your hardware config to the minimum required set of parts to boot. I presume you can boot up with just one PSU with minimum hardware config? Can you boot with both PSUs connected? With expander board?, with just one RX 570?, etc..
I think your right. everything in this rig is suspect right now. I am not sure how much stuff I burned up. I am going to get out a fresh MB and PSU and test cards one by one to see what i have left. then I will test the old PSU one by one. Then I will try something different. this is the second time I have done this now with this rig. I personally think its either the coolermaster somehow doesnt play nice or the expander board and the Asus Z270AR dont play nice. It was a major burnout though....not good at all. All this money sitting here idle now.
