Will not turn on
If there is no LED on, then the most likely reason is, that your wii isn't getting power. So the problem, is with the plugs, and the power adapter. If you have a friend who has a wii, try testing his power adapter on your wii. Make sure your cords are completely plugged in, on both sides, (the outlet and the wii) then press the power button on the wii. If that dosent work, try turning it on with one of your wiimotes. If that dosent work, that means your wiimote is not syncronized with your wii. To sync. it, open the sd card cover on the front of the wii, press the red button above the sd card slot. Then open the bottom of your wiimote, (where the batteries are) and press the small red button that should be beside the batteries. Then hold the wiimote close to the wii,then after its done flashing, press the power button on the wiimote and also, try plugging your power cord into another outlet.
If it still won't work, you've got a broken wii, so you better send it to get replaced or fixed, again as suggested. DON'T OPEN IT! You could loose your warranty if you open it, so it's safest not to. Hope you get it to work.