Problem with the WII

I would try re-syncing the remote. There should be a little red button on the remote underneath the battery cover and a little red button on the front of the wii by the SD card slot.

I forget the order you have to press them in, but I think you do the console button first and then the remote button. It should be in the instruction manual or a quick google search.

To the OP, what are your lighting conditions? If you have lamps or open windows (during the day) near his TV, those light sources may be causing interference.
If not, you can call Nintendo's support number and they'll troubleshoot with you. It could very well be a bad remote or a bad sensor.

The sensor bar doesn't really do much. It just has little sets of lights on both ends. If you take a picture or video tape it, you should see 2 or 4 little blue dots emitting from the bar. If those are not there, then that's probably the problem.

Otherwise, I would think its a remote issue. However, if you have multiple remotes, I would find it weird if they all did not work at that point I would chat with Nintendo support to see what they say.