Have you tried using one GPU directly plugged PCI-e x16 slot on the board, then fire up miner?
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I suspect that is it my motherboard or power supply.
If the above setup runs successfully, you either have a bad riser or power supply issue
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So I attempted to put one of cards on the PCI-e 16x slot, and it worked fine. Hashed without issue. However, I do not believe it is the riser. I have swapped out MULTIPLE risers and still had the same issue. So you think it is the power supple then??
Then you can add one more card using a riser, just to make sure what the issue is. If with one card directly plugging to PCIe 16x plus one other card using a riser was fine, then add one more card.