I'm buying 5 months old Macbook Pro here are specs: MBP 15,4" i7 2,5 Ghz HD6770m 1GB 8 GB RAM 750GB HDD HiRes Antiglare What are most common errors on this model I should watch for? What is the best quick usb portable diagnostic tool to test this MBP? Price is $1250, I hope it's not stolen. Is there any way how can I check if it's stolen? Seller doesn't got receipt but he gave me a picture of Sys info where I could read serial number. I did check serial number on popular "report stolen" sites - and nothing I checked on and warranty is valid till january 2013.