Hi my son gave me his MacBook Air he purchased in 2014. He purchased a new one. He erased everything, when I power up I have a blank screen with a "?" , how can I load the O.S. ?
Hi, My son gave me his old MacBook Air he purchased in 2014, he purchased a new one. He erased everything before giving me. When I power up I have a blank screen with "?". How do I load a new O.S. ?