Exact same issue... Press power, fires up fir a second then powers right down. Pressing the power button again does nothing.
Only way to get it running was to turn off the psu at the switch, leave it off for a couple of seconds. Then turn it back on and everything works fine.
I rma'd my mobo twice and psu 3 times before I figured out that using the 4x4 CPU cable fixed the prob




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