Check this out:
http://www.nintendo.com/consumer/sys...e.jsp#language
In summary, it's probably the sensor bar.
If your screen appears frozen at the Language select screen, we have found that to be related to the Sensor Bar. Please try the following:
1. Ensure that the Sensor Bar cord is plugged to the back of the console, and is placed properly at the center of your TV screen. For detailed directions on setting up the Sensor Bar, please click here.
2. Check to be sure the Wii Remote is synced to the console, by using the Power button on the Wii Remote to turn the console on. (The power button is the small white button with the red symbol in the top-left corner, just above the Control Pad). If this doesn't work, try to sync the Wii Remote. Once synced, try to turn the power on the console on and check for proper response.
3. Make sure that the Wii Remote is being used between 3' and 10' directly in front of the TV and that there are no bright light sources affecting the Wii Remote's operation (review Game Play Guidelines for more information), and that the Sensor Bar is placed properly (see Sensor Bar setup). Avoid sources of infrared light in the gameplay area such as electric, propane or kerosene heaters, flames from fireplaces or candles, and stoves or other sources of heat.
If you are still experiencing problems after trying the steps above, then your Wii console or Sensor Bar will need to be repaired. Please click here for repair options.