My wii refused to turn on. After the obvious checks (yes, plugged in, yes, outlet has power, tried two outlets, pushed on button repeatedly) I checked google.
I recently had a power outage. It seems the wii, got scared, crawed into a digital shell and decided to hide there. To make it forget the scary experience, unplug for about 5 minutes– not just off, completely unplugged away from the wall.
Then plug it all back in and it works.
The wii seems to have some sort of fuse that resets when unplugged from the wall. Grandma would never have figure this out.