On El Capitan, is it possible to display picture just on an external monitor, and not on the laptop's screen? On El Capitan, is it possible to display picture just on  an external monitor, and not on the laptop's screen? I want to close my laptop and use it as a desktop, and I have every other piece of external periferals (wireless mouse, keyboard and external monitor) needed.
If you have another keyboard and another mouse you can close your MacBook Pro :

If an external display is detected and the MacBook is plugged to the power, you can close it without any software.