One of two common possible problems. Either 1) Your AC adapter needs to be reset or 2) Your AC Adapter is bad.
Most power issues with the Wii can be fixed by resetting the AC adapter. You can easily reset the AC adapter
by following these steps:
Unplug the Wii AC adapter at both ends (from the back of the Wii system and from the wall outlet or power
strip).
The AC adapter must remain unplugged at both ends for a full 2 minutes.
After you've waited 2 minutes, plug the AC adapter into the Wii system and
directly into a wall outlet,
not a surge protector or power strip. If the power light comes on and
stays on, then it appears resetting the AC Adapter worked.
If it's not working, you can get a *new* NINTENDO brand AC adapter at the following page. Beware of cheaper knockoffs around the internet.
http://store.richspsxparts.com/ofniwiiacadr.html
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