Cobalt noise?

Hi,
I just recently bought a chevy cobalt (base model) and it makes a weird buzzing noise from time to time where the information button is. Does anyone know anything about this? the noise seems to come on then go off
after a few minutes all on its own.
A.O. http://www.hits4pay.com/members/index.cgi?adnano
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Does this happen mostly when you are sitting still with the engine just idling? When the car is in neutral, park, or reverse? Just curious. Also, do you have OnStar by any chance?
Ron M.
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