Looking at some macbook that's 2.5years old its a 2008 model. I inquired about further details (specs). But i guess it has corrosion on the side where the charger plugs in so it doesn't charge the battery.. Any ideas why this would corrode in the first place? Is it even worth looking at this laptop? Its a decent price just depending on the specs now of it of course. This would be one of those aluminum body ones correct?