Vibrating noise from new MacBook Pro, link for sound

I bought macbook pro 2014 about two weeks ago. Few days ago i started hearing something like vibrating sound coming from somewhere around power button. it happens when i turn my computer on (not every time) and then it stops sometimes by itself and sometimes i have to put it in sleep mode again and then turn it on. this noise is happening every five seconds and it is not loud, but you can here it when working on computer normally. i have recorded it with my iphone which was very close, so the sound is little louder than you would hear it normally.

here is the link - http://yourlisten.com/mortimer331/macboo...

you can hear the sound at: 3 sec, 8, sec, 13 sec and so on.. turn up the volume :)

specs: MacBook Pro (Retina, 13-inch, Mid 2014) 2,6 GHz Intel Core i5 8 GB 1600 MHz DDR3 Intel Iris 1536 MB

first i thought that it was a fan, but then i downlaoded a program to control the fan speed and it is completely different sound, so i ruled that out. also, it happens regardless of being connected to power adapter or on the battery.