After all, many PCs use DisplayPort cords, while TVs rely on HDMI for their inputs. Even with this bit of mismatching, it’s still incredibly easy to use a TV as a computer monitor.

But if you only see a blank area of your desktop, without any open windows or a menu bar, try hitting the Command and F1 keys to switch OS X back to mirroring the built-in screen. You could also use a ...