Apple has released an EFI firmware update for all 11-inch and 13-inch MacBook Airs.
About MacBook Air EFI Firmware Update 2.0
This update resolves a rare issue where MacBook Air boots or wakes to a black screen or becomes unresponsive. This update is recommended for all 11-inch and 13-inch MacBook Air (late 2010) models.
The MacBook Air EFI Update will update the EFI firmware on your notebook computer. Your computer's power cord must be connected and plugged into a working power source. When your MacBook Air restarts, a gray screen will appear with a status bar to indicate the progress of the update. It will take several minutes for the update to complete. Do not disturb or shut off the power on your MacBook Air during this update.
You can download the update by selecting Software Update from the Apple menu at the top left of you screen.
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