My XBOX 360 makes a whizzing noise?

when i put a disk in it makes the normal noise but when the game starts to play it starts to make a small whizzing noise it does read all the disks i put in. but i was wondering what the problem could be, someone was putting a hook on my wall for a picture and when drilling they didn't put something over my xbox so it got a bit of dust on i thought that could be the problem so i sprayed some air duster in there (canned air to clean dust out of things) i sprayed it in the front where the disk tray is, in the holes in the side and in the back. is it breaking or is it just the normal sounds. AND NO IMMATURE COMMENTS LIKE PS3 IS BETTER