Macbook Pro Retina - Weird sound when plug in adaptor

Hi,
I have had my Macbook Pro Retina 15inch now for about a year and a half and suddenly it's making a sound whenever I plug it in. It's like the sound of a hard drive, but it's in sync with when I scroll up and down. There's no sound whenever it's unplugged, it's very strange. Any ideas, could it be a faulty adaptor?
Thanks
Lewis

It is better to take the computer to the Apple store and have it checked out.
If this does not help, contact Apple.
Genius Bar reservation
http://www.apple.com/retail/geniusbar/
Best.

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Macbook Pro Retina - Weird sound when plug in adaptor

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