I'm going to be selling my macbook pro soon. what are the steps to ensure none of my data is on the computer. I was tihnking of backing everything up to time machine. then load snow leopard and iLfe back on to the computer from there update then sell did I miss anything? Also where are the best place to advertise. How much is my mac worth? Macbook pro 13" (2010) 2.66 intel core 2 duo 4gb DDR3 RAM Nvidia GeForce 320m 256mb graphics 500gb SATA hard drive Apple Care (about 20 months left) Thanks in advance.