If you only have 6 video cards, I recommend you just buy a regular gaming motherboard with more slots than usual. Buy a few M.2 PCIe risers or a 4-way x1 to x4 PCIe splitter card.
Agreed. And am I mistaken, or does the H110
BTC+ have more than 6 pcie slots? The reason I ask is because OP is asking for this as a recommendation, which is what I thought he initially had:
-ASRock H110 PRO BTC+
OP, you took the mobo to a computer shop and they verified that it's dead? Did they say what was wrong with it? If so, I'd go with what Coinfarm ventures said and just get a decent gaming mobo with one of those pcie-USB multiplier-thingies. That way you could upgrade your memory and CPU. I know a lot of people say you don't need a high-powered CPU or much memory for mining, but it helps if you're using Windows IMO.
In any case, I think motherboards designed for mining are extremely overpriced, and you can guy a decent gaming mobo for much less.