Hi, I'm in a problem. I have no back up or bootable OS X USB, and I can't access Mac OS since I completely formated the hardrive and installed windows. However, it seems I can access the recovery mode and download the Mac OS and install from there. My internet is very slow. So I need to turn off the display while the OS is downloading from the recovery mode, but I can't do that using regular keyboard keys. Anybody know how to turn off the display while it's downloading? Any solution would be a great help. Thank you!