Refurbished Laptop Keyboard Weird Noise

[badatlaptops]

So i have purchased a refurbished laptop, and after a few days when i type with the Keyboard it makes a weird noise. It sounds mechanical (idk how to explain it) and there is nothing in the keyboard. The sound only registers with certain keys, and sometimes does not trigger.

I have tried sticky keys, and this weird laptop noise is bugging me out

It is a SONY VAIO E SERIES GUN METALLIC

 

[badatlaptops]

UPDATE: When I tap around the keyboard, the noise is also triggered.

 

[esco_sid]

Only way to find out is to take it apart but that would void your warranty so i would just return it or submit a warranty claim