Vertical lightning bolt inside of circle for mac app

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In most cases the problems may be caused by:

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Mac OS X- Gray screen appears during startup Solutions may be found in:Ī flashing question mark appears when you start your Mac

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Their causes are outlined in Intel-based Mac- Startup sequence and error codes, symbols. These are related but not identical issues. Question (?) Mark, Blinking Folder, or Gray Screen at Startup See Mac OS X- Gray screen or prohibitory sign appears during startup.

 

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