Have you tried resetting the AC adapter? If not, then try doing this:
Unplug/remove all accessories from the system (including game discs, SD Cards, memory cards, Nintendo GameCube controllers, hookup cables, the AC Adapter, and Sensor Bar) from the outlet and Wii.
Let the system rest for about 90 seconds. While you're waiting, check to see that controller cords, AC Adapter, and Stereo AV cables/Component Video cables are not frayed or have exposed wires (this can cause the system to shut off); if so, you should replace those parts.
After the 90 seconds, Plug the AC Adapter into the system and directly into a wall outlet, not a surge protector or power strip. Check to see if the power light on the Power button comes on.
I have a new WII and can't get it to work. I'm using a Sony TV and a Sony VCR --- WII pluged into...
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I have a new WII and can't get it to work. I'm using a Sony TV and a Sony VCR --- WII pluged into VCR can't get WII menu screen to come on. What Am I doing wrong?