Unfortunately I'm a bit blind here as I do not personally have an Apple TV since I opted for Chromecast since I'm not a fan of iTunes. However with that said, I do own Mac PC's and got my girlfriend a decently used one for a good price, she also coaxed me into getting her a used ATV 2 I think. I honestly don't remember. She's started using Airplay and just called me that when she clicked airplay, her Macbook went blank but she could watch the movie on her ATV. But she wanted to then browse the internet WHILE watching the movie, but as I said, her macbook screen was blank. Can somebody give me a rundown? She's at El Capitan. I know it's a long shot but any advice to help her in the future would be appreciated.