Strange cracking noise from laptop

[prishila]

My laptop makes a crackling noise every one second. I have just bought a used one and I have the opportunity to turn it back and take another one. What is the problem and what should I do? Thank you.
Laptop noise: https/clyp.it/iktv2f0e#

 

[prishila]

MERGED QUESTION
Question from prishila : "Strange crackling noise from laptop"

My laptop makes a crackling noise every one second. I have just bought a used one and I have the opportunity to turn it back and take another one. What is the problem and what should I do? Thank you.
Laptop noise: https/clyp.it/iktv2f0e#