Weird noise MacBook Air 13"

[brownjoh]

Hello, does anyone know what this noise from MacBook Air 13" could be?

- 0:03. It comes at the startup or after waking it up from sleep. Thanks for any help!

 

[Fishrrman]

That's the "boot" sound?

What happens AFTER you hear the sound?

Does it reboot, or do something else?

 

[brownjoh]

No, it is just this "crack" sound that you can hear at 0:03. Everything works perfect, the MacBook is two weeks old. It happens just when I wake it up or start up.