crackling sound when opening macbook

[greekling]

Sometimes when I open my macbook when it's sleeping it makes this weird crackling noise for a couple seconds. Is this normal?

 

[Mac'Mo]

Yes, entirely.

 

[PagesP]

crackling sound when opening macbook

Yes, entirely.

Mac'Mo,

Can you please explain why this is normal? I just bought a MacBook Pro 13" and hear this noise (like wood burning or like a the recycle bin being emptied) every time I open the lid of my sleeping macbook.

Thanks in advance!