Does anyone else notice this? Is this pretty common in the 12" ibooks? That little silver button under the trackpad that you push to release the lcd lid when the computer is closed. I notice that there is a little give in it - I can slide the button up and down just slightly. Unfortunately, when it is in a certain position, it makes a slight rattle when I click the trackpad button. Has anyone else experienced this? And if so, can anything be done about it? Can it be fixed?