Step by step instructions on how to reset the Wii AC Adapter.
What to do:
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 two minutes.
Unplug anything connected to the USB ports and the Nintendo GameCube Controller ports (such as LAN Adapters, keyboards, Nintendo GameCube controllers, etc.).
Check the AC Adapter for the following:
Make sure that the word "Wii" and the model number "RVL-002 (USA)" are molded into the AC adapter. Unlicensed products are not fully compatible and may not work correctly.
Check the AC Adapter for physical damage. Physical damage, such as frayed wiring or a cracked housing can cause the system to shut down. If the AC Adapter shows signs of physical damage and needs to be replaced, a replacement can be purchased from Nintendo's online store.
After waiting two 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 the AC Adapter reset was successful.