Toss that board and get a ASUS Minin Expert M/B and be done with the BS. I run 3 of them and they are MADE FOR MINING!
you add nothing to the solution...
"made for mining" it's just a motherboard, and honestly ASUS Minin Expert has a history of being anything but a mining board.
MSI Z270-A pro is great for mining.
Well, I dunno! OP: check everythign is actually connected, then time to play with the bios. Start with one card on risers, and triple check your manual for counterintuitive slot configs.
TBH I've spent hours struggling with various gaming boards, and given the cheapness of mining boards at the moment I'd definitely just get a dedicated one. They're cheaper than gaming boards, and you'll get the slots working easier...