Bought a secondhand macbook pro. There was still stuff on the computer, i didnt want, so i erased it. It's asking my to put in my apple id ,and when i do it, there is a error that its not avaible right now. ( im doing a factory reset..) There was Yosemite on the pc before, and i dont got that on my apple id. I still got the Snow leopard cd. What should i do? Im stuck on the installation screen; OS X Mavericks.