We recently were missing the sensor bar that supposedly receives the signals from the remote controllers and were unable to start any of the games without it.
Are you missing your Wii's Sensor Bar? Is your sensor bar defective? Here's how to start playing a game without the sensor bar.
Simply take 2 light sources (flashlights or candles should do the trick) and place them where the balance bar was. The lights will allow the remotes to operate.
Note: Be sure to keep candles out of your childrenś reach.