I am thinking of doing the Apple trade in program and getting cash for my Macbook Pro. Its on the apple website. They send a box for it and ship it free back to them, then they cut you an apple gift card. 1) Has anyone done this via apples site? (please no 'i can get more on ebay' comments) 2) Having done taxes and other financial info on the laptop for a few years how can I fully erase the system so that its as secure as possible? Just secure erase the HD? What else? Thanks!!