I may just be complaining about nothing here, but does anyone who owns one of these machines experience a popping noise on the left side of the machine when you pick it up or apply slight pressure to the area with your hand. I didn't notice it until today when I kept laying my wrist on the left side to type and it kept making a popping noise around the far left side of the track pad. It sounds an awful lot like the aluminum is cracking but on the inside. I checked the case on the outside for any sings of damage and there seems to be none. Is anyone else experiencing this? The machine appears to be running fine but its worrying because it seriously sounds like something cracking inside.