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A flashing question mark appears when you start your Mac

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Operating Systems OS X (Apple) OS X Support RSS A flashing question mark appears when you start your Mac
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Old 11-07-2008
A flashing question mark appears when you start your Mac
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. Usually, all you have to do to get your Mac back up and running is remind it where its software is. After the flashing question mark appears, one of two things may happen: The computer starts up normally after a brief delay. The computer does not start up.

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LEARN ABOUT OSX

sw_vers

SW_VERS(1)						    BSD General Commands Manual 						SW_VERS(1)

NAME

     sw_vers -- print Mac OS X operating system version information

SYNOPSIS

     sw_vers
     sw_vers -productName
     sw_vers -productVersion
     sw_vers -buildVersion

DESCRIPTION

     sw_vers prints version information about the Mac OS X or Mac OS X Server operating system running on the local machine.

     When executed with no options sw_vers prints a short list of version properties:

	   % sw_vers
	   ProductName:    Mac OS X
	   ProductVersion: 10.3
	   BuildVersion:   7A100

     The ProductName property provides the name of the operating system release (typically either "Mac OS X" or "Mac OS X Server").  The
     ProductVersion property defines the version of the operating system release (for example, "10.2.4" or "10.3").  The BuildVersion property
     provides the specific revision of the operating system as generated by the Mac OS X build system.

OPTIONS

     The output of sw_vers can be refined by the following options.

     -productName     Print just the value of the ProductName property.

     -productVersion  Print just the value of the ProductVersion property.

     -buildVersion    Print just the value of the BuildVersion property.

EXAMPLES

     % sw_vers -productName
     Mac OS X

     % sw_vers -productVersion
     10.3

     % sw_vers -buildVersion
     7A100

FILES

     /System/Library/CoreServices/SystemVersion.plist
     /System/Library/CoreServices/ServerVersion.plist

Mac OS X							  March 10, 2003							  Mac OS X