Machine has ran fine for just over a year.
Yesterday morning it was off and I normally leave it running.
No POST or even Power when I tried to start it.
I have an identical PSU in another machine, swapped them with no change. PSU isn't the issue.
Removed all components from the board but CPU and same behavior.
Sometimes when I plug the power back into the PSU and board the power button on the board itself will flash but still not power on the machine. It just flashes over and over again.
Any ideas other than bad board?