My wii has power but no picyure why?
Check The cables that connect to the TV. Make sure that the cable is securely connected to the console. Next make sure that if your using the Red, White, Yellow composite cables everything lined up. Yellow is video and should go with the slot labeled video on the TV or the yellow slot on the TV. Red is right audio and should be put in the labeled spot for right audio on the TV or with the red spot on the TV. Lastly white is left audio and should be put in the spot that is labeled left audio on the TV or in the white spot on the TV. If all of the cables are hooked up like so, and everything is secure yet there is still no picture, you need to buy a new cable because it seems that one may have been damaged. If there is still no picture with the new cable, then your last option is to try it with another TV. If it works with the other TV, the 1st TV your trying to put it on has a faulty composite input. If it still doesn't work on the other 2nd TV, then there is an internal problem with the Wii and needs to be repaired or replaced.
Hope this helps!