It doesn't look normal. What does the shop say if you complain?
Anyway, even if they say it's normal, you might be able to return it if you're not happy with it. And then you certainly should do that.
I bought an Asus Zenbook, and there is a constant electronic buzzing sounds with occasional clustered beeps when it begins working harder, coming out of the top left (by the esc key) of the computer. I'm not sure if this is a sign of a loose connection, or if it's a normal sound.
Here's an example:
https://soundcloud.com/daren_z-1/zenbook-sound-dont-listen-to-this-please
Thanks!

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic