The motherboard is definitely broken. I mean I spent about 13 hours yesterday fiddling with it. There is something wrong with the sata ports which most likely happened due to the PSU failure. All the other parts (CPU, memory, Liquid Cooling system etc) seem to be working flawlessly. (thankfully)That's some bady luck :/
I know how you fell. I've recently built a new rig also and I was having a persistent Blue Screen Crash failure (Memory Dump). After a loot of distress I manage to work it out (sound drivers conflict)
Maybe you need to update your BIOS? In the worst caise you will have to sendo your Motherboard to the RMA. Your hardware are still with garanty, right?
Will RMA both the MB and PSU. The problem is that I bought them from separate places so if the store I bought the MB from deduces that the MB didn't break on its own I might have to get a new one. :/


