Just to weigh in, we're building a v3 build at my office and we had this same issue, RMA'd the board, and it was exactly the same as the first one. Our first one came with bent pings on the cpu slot, too. This one seems fine on the surface, but it still has the same 10 second boot loop issue.
I'm going to try and flash a firmware update and see how that goes.
edit: Board is officially not posting, and therefore can't be flashed. RIP. I'm using an i7-5820k, by the way.