Hi, I recently sold my Macbook Pro on Ebay to a buyer. Before I sold it, I upgraded the hard drive (brand-new) and installed Yosemite, leaving it at the welcome screen so that the new owner can set it up with his own details. Now 2 weeks later, the buyer is saying it's asking him for an iCloud password that he doesn't know and he's asking me for it. In all the time that I used the macbook I never set up or used iCloud on it so I don't understand how this has happened. Can anyone help?