He, i just bought a 2011 MacBook Pro 13" and have been extremely happy with my purchase. But recently i have noticed that when a pair of 3.5 mm headphones are plugged into the jack if you push down you can hear a slight click, and and the jack moves slightly. You can actually see the SD cards slot inside the MacBook Pro move slightly when doing this, which means the actual Mother board must be loose. And i do have a MacBook Air and i tested it with the same headphones and it does not do this. So i was wondering is this normal? Or should i go to the Apple store and have it checked out. Also i want to say that sound through the headphones works fine - i guess i have just come to expect better build quality from Apple.