Select your Mac OS X startup disk with Startup Manager by restarting and holding the Option key.If any step resolves the issue, you don't need to continue to the next one. If your Mac still starts to a flashing question mark, follow the steps below. If the flashing question mark issue persists, reconnect the keyboard and mouse. If the issue persists, shut down your Mac with its power button, disconnect any external mouse and keyboard, then turn on your Mac with its power button. This issue might occur if a mouse or trackpad button is pressed during startup. Tip: If your computer has a gray screen (with no flashing question mark) startup issue, see Mac OS X: Gray screen appears during startup. Sometimes, your computer may not start beyond the flashing question mark.
In most cases, reselecting the startup disk is all that is required to resolve the issue. It's normal to see the flashing question mark when a startup disk has not been selected.
If your computer starts up normally after a brief delay, you probably just need to reselect the startup disk in Startup Disk preferences. Usually, all you have to do to get your Mac back up and running is remind it where its software is. If you see a flashing question mark when you start your Mac, it's probably because it can't find the system software it needs to start up. SOURCE: Why is my macbook air a1466 showin a file with aĪ flashing question mark appears when you start your Mac
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