Yesterday it was automatically updated but after restart a ? Sign starts blinking in the middle of screen
I turned it off and on several times but without any use.
MacBook Air (13-inch Mid 2011), iOS 11.1
Hi,
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 seconds, use Startup Manager to start up your Mac, then select your startup disk from System Preferences.
If a question mark appears after you install a software update, select your startup disk again using macOS Recovery.
MacBook Air does not start after recent update
