Hi guys, I own a macbook pro 15" early 2011 that I recently bought for college, I've been content with it so far, however I am a little bit concerned about its power button. It is generally difficult to press and when is only responsive when depressed fully, as in I when press it down, nothing happens until I put a little more force to depress the button entirely. It is a minor annoyance. Are all macbook pros built like this? Should I go to my Apple Store to get it checked out?