Noise coming out my macbook

Got my lovely new macbook about two weeks ago.
However it seems to make a slight buzzing noise. It goes quiet when you make it think (eg. open an app) bu then goes back to buzzing again.
It isnt very load but quite anoying.
Is this normal? Should i update the firmware thingy? Any advice?

Hi Gibson,
I have noticed the same noise. However, it's only present when the power cable is plugged in and the battery is charged. Try unplugging the power, if you have it plugged in. I've read that other people experience this issue, and I guess it is "normal".

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