I just recently bought a macbook pro retina (about 3 weeks ago). for the past few days I have noticed that if I press on the bottom cover, around the middle, there is a springy sound. does anyone know what that is? i don't have the scredrivers to open the bottom cover. Is this something normal? another thing is, I noticed that the black hinge on the back of the laptop is not flush with the rest of the aluminum of the laptop, as a result, the screen is not aligned exactly with the keyboard of the laptop. maybe off by 1-2 mm. anybody seen issues like these before or are they within spec?