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Feb 28, 2016 10:59 AM in response to mirna_hby judysings,Hi mima_h,
If your MacBook Air will not turn on, or you see a folder with a question mark for a few seconds at startup, take a look at the resources below to troubleshoot the issue.
About the screens you see when your Mac starts up
You might see one of these screens appear during startup if you've changed your startup options, or there's an issue starting up your Mac.
Folder with a question mark
If you see a folder with a question mark appear instead of the Apple logo, it means your Mac couldn't find a local or network-based startup disk. This can happen if the disk selected in the Startup Disk pane of System Preferences isn't available. Wait a few seconds to see if your Mac is able to locate the startup disk you specified.
If you still see a question mark after waiting a few moments, use Startup Manager to start up your Mac, then re-select your startup disk from System Preferences.
If a question mark appears after you install a software update, re-select your startup disk using OS X Recovery.
Take care,
