I am on my second power brick for my Wii, and it is maybe 6 months old and rarely played. The first time it went out, the Wii would not power up at all, and there was no light on the power switch on the front of the Wii. I tested the Nintendo AC adapter, and it turned out to be bad so I bought a Nyko replacement.
The Nyko has a blue light on the brick to let me know it is getting power. This worked for a short while, but then the Wii stopped working again. This time there was a red light on the power button but it would not power up, no matter how much I unplugged everything and reset the unit. The blue light remained on the Nyko adapter, but nothing worked. This time a call to Nintendo had a new (refurb) AC adapter shipped to my house in a day.
So now that it is working again, I am suspecting something in my setup is causing failures. Do you leave your Wii in stand-by mode (amber light on the power switch), off mode (red light) or turned off completely at a power strip? I am beginning to think I should plug it into its own strip and use that to power it on/off.