hmmm try these things:

1. make sure the "sensor bar" is plugged in.
2. make sure your not too close or not too far from the "sensor bar."
3. make sure the "sensor bar" isn't blocked by anything.
4. and if other wiimotes are working but not that one, then try resyncing it.

and if none of these help then sry, that's all i can think up.

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