2008 Infiniti G35 is not allowing for smart key to be programmed?

Hi everyone i just bought a Infiniti g35 from the auction for 11,500 the seller said that the only thing wrong with it was that they lost the keys. I had someone who makes the smart key go to my home and try to program it he said that the computer was not allowing him to do it he did not know why he said there may be a burned fuse or something .We checked all the fuse and everything seems fine. Does anyone know what else may be causing this Why cant they program the key ? Am going to get it hooked up to a computer and get it checked out . Hopefully I didnt get robbed. What do you all think