In most cases the problems may be caused by:
Mac OS X- Gray screen appears during startup Solutions may be found in:Ī flashing question mark appears when you start your Mac
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.