Good luck, if it still doesn't work I'd try to get a spare PSU to test with (as it's easier to swap out) and then I'd look at the motherboard.No worries, it's a fair assumption to make these days but Intel made more sense on price/performance for me right now.
I haven't tried messing with c states but I'm afraid it's not an option any more as the memory is with DPD on it's way back to ocuk .
I've got a Corsair kit arriving tomorrow that's based on Samsung chips so I'm hoping that will just plug and play with no issues.