Have you tried a second power button? While that shouldn't be the cause of the problem as they typically don't fail. However if it saves you from RMAing a good board, it is worth a shot (best to eliminate the issues which you can check yourself, before sending out all your gear to find out it was a dead switch).
Don't take this the wrong way, but have you verified the power source that is feeding the PSU to be working? IE, other accessories on a power bar work fine / tried a different wall outlet - power bar outlet?
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