My Bell wireless bike computer wont work!!! Help!?

I got a mountain bike for Christmas, and I went out and bought the bike computer today at Walmart. I just now got around to installing it, and got it all set up, but when I spin the front wheel, it won't register. I've moved the censor&magnet, got new batteries but it won't work! The speedometer,... show more I got a mountain bike for Christmas, and I went out and bought the bike computer today at Walmart. I just now got around to installing it, and got it all set up, but when I spin the front wheel, it won't register. I've moved the censor&magnet, got new batteries but it won't work! The speedometer, odemeter, or anything of the sorts will work. I'm working on it inside my room (we have a internet router and my ps3, which pulls in the wifi, all in my room) so would that affect the computer? What's wrong with it?????
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