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Recently, a YouTube video of the issue surfaced, showing an extreme condition of the bug, and its apparent tie to physical movement of the systems: The random nature of the problem suggests it is likely not software-based, so it may revolve around a physical sensor such as a magnetic switch in the lid or chassis, that could be contributing to the problem. Additionally, it appears to happen more when on battery power than when plugged into its AC adapter however, some have reported it happening on AC power as well. This bug appears to affect both the 11-inch and 13-inch models, though the problem seems to happen more with the 13-inch MacBook Air.
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When the screen flashes intermittently, the system does not appear to shut down or sleep, since audio and other activity may continue however, this does not occur at the times where the systems do go to sleep. There is no indication on how widespread this bug is, but a number of affected users have noted the problem in a lengthy and growing Apple support discussion thread. When using an affected system, the screen may randomly blink to black for a brief second, or go to sleep and require a button be pressed for the system to wake again.
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Apple's latest MacBook Air systems offer attractive improvements over prior models, but some of the systems appear to be suffering from a bug that results in intermittent loss of video output.