hello 
i have also this laptop F series sony vaio  laptop but its not working fine it stuck again and agian its going to direct restart by itself  and if iam download some thing so its voices change if songs is played.and change grafic pixcle  i give a advices or my bad experinces about sony vaio company so  please do research first about your laptop  then buy sony vaio  i don,nt know what happen with sony company its loos his repotation 
thanks