Apple has released MacBook Air EFI Firmware Update 2.0 for the newest MacBook Airs. The update addresses "a rare issue where MacBook Air boots or wakes to a black screen or becomes unresponsive," according to Apple, and it's a 2 MB download you can find either at the link above or via Software Update.
This is the second firmware update in as many months for the new MacBook Air; an earlier update, released just as the models began shipping, addressed faults with the MacBook Air's graphics. Just like that earlier firmware update, today's will require a restart, and Apple advises that you "do not disturb or shut off the power on your MacBook Air during this update."
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