How do you know the board is getting power? ( is the red light just staying on when you press the power button?)
I would do this
1. unplug everything except the power adapter plug.. (ie.. no USB devices , no HDMI , literally unplug everything except the power)
2. press the power button? ( does anything happen? .. like does the light turn blue and then turns red quickly? or does it just permanently stay red )
3. Try to borrow a different power adapter...
I doubt it's the fan as the Wiiu can stay powered up for a few minutes without a fan spinning..