How to reinstall OSX on a Macbook Air whose screen is broken, and OS has been erased? So I've had this Macbook Air for a while with a completely broken screen, and I wanted to give it to a friend who would work with it using a second screen. 
I plugged a second screen to start reformating, but of course once it rebooted, the image wouldn't go to the second screen.

So I'm stuck with a Macbook with a broken screen in the middle of the process of reformatting.
I'd like to reinstall OSX on it.

What do?
There are several options:


Plug in an external monitor and then you should be able to follow the install process.
Target disk mode, but as it's a MacBook Air this would be dependent on having a Thunderbolt port, that you can connect directly to another Thunderbolt port, or a Thunderbolt to Firewire adapter into an older Mac with Firewire.