hello all, i am a newbie with mac laptops. i have a macbook pro 15, core2 duo, 4 gigs of ram. i received this as a gift 2 months ago. i noticed whenever i scroll up/down a web page or in itunes i notice a static noise coming from the top left corner. (its either coming from the magsafe adapter or ethernet ) the noise also lessens when i run photo booth in the background i tried to read up on it and i was left asking more questions than i started with. is this a common issue? can it get worse in the long run? because i am sure this lappy is no longer under apple care. any thoughts?