Hi I can buy a Macbook Pro for $900. Its a 15.4" 2.16Ghz one. Do you think $900 sounds fishy? It seems to be too low, right? As I have never bought a used computer and also never bought a Mac, can you please give me some links to give me some precautionary measures and any other important things? It comes with the disks and the person has shown me 4 pictures of it. Please help me.