What is this noise and where is it coming from?

MBP 13", just over two weeks old, and it's making this high-pitched static-y crackling/buzzing noise. It's fairly constant, although it cuts in and out slightly at times. Sounds a little like a very faint radio stuck between stations, but more metallic and at a higher pitch. What is this, and how do I get it to stop? It doesn't seem to be related to speakers or volume settings at all, and audio is working fine. It sounds like it's the machine itself.

Try running the Apple Hardware test first. If it is the fan, you should get an error code with "MOT" in it. If you do, you should probably plan to replace both fans.
Also, check out your hard drive with S.M.A.R.T. Utility:
http://www.versiontracker.com/dyn/moreinfo/macosx/32454
You can download the demo and run it several times for free. If you have the original hard drive, be aware that most hard drives have a useful life of 3-5 years, and yours is getting into this category. If you find you need to open up the Mac to replace a fan, it would be a good time to consider replacing the hard drive with a bigger and faster one. Especially if S.M.A.R.T. Utility shows errors, even if the drive is not yet failing.
If you need take apart instructions, you can find them here:
http://www.ifixit.com/
Good luck!

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