MacBook Air (Mid 2011) shows a black screen after trying to install EFI Update 2.9
Follow these steps if your MacBook Air (Mid 2011) doesn’t finish the EFI Update 2.9 firmware installation, and a black screen appears after the computer restarts.
- Make sure your MagSafe power adapter is plugged in to a power source and connected to your MacBook Air.
- Press the power key for at least ten seconds.
- Release the power key.
- Press the power key again to turn on your MacBook Air.
Your MacBook Air may take a few minutes to power on.
Last Modified: Jul 25, 2014