If you got it from wal-mart put it back in the box and take it back. When they say it's been too long, bitch about them not standing behind their products and if that doesn't work ask for the manager and keep bitching till they swap it with a new one.
It will work, I did the exact same thing after a storm took out my ps2 that I got at launch a few years ago. It was on a surge protector too.
It's also possible that the only damage is in the power supply inside the wii. You might be able to crack it open and just replace the power supply PCB to get it working again. Did that with a Dreamcast once.
cheers,
-DT