Black Macbook Making Weird Fan Noises

[Luigi239]

Hello. When my Macbook is running, sometimes the fans will spin up, and then a high pitched noise will come out, which is extreemly annoying in a quiet room. Is this normal? What's wrong?

 

[mad jew]

Probably normal. How loud are we talking though? If you play music in iTunes, can you still hear the squeal over the top?