A friend of mine has one of the white plastic Apple MacBooks. It's having an issue where it sounds like either a fan or something is rubbing or the audio card/speakers are sounding a weird sound like it has some sort of glitch happening.

I can't fully tell where exactly the sound is coming from but it's fairly audible and something you can tell is NOT a normal function of this setup. I have recorded the sound for you to hear. Anyone know what this issue may be? I have seen other threads and youtube videos of Apple Laptop noises but none sound like this one. Any help?

here is the audio clip: