A flashing question mark appears when you start your Mac

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11-07-2008

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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

xgridctl

xgridctl(8)						    BSD System Manager's Manual 					       xgridctl(8)

NAME

     xgridctl -- Xgrid Daemon Control Interface

SYNOPSIS

     xgridctl [target] action

OPTIONS

     The optional target is one of the following:

     controller    perform the action for the xgricontrollerd daemon

     agent	   perform the action for the xgridagentd daemon

     The action is one of the following:

     status	   print status for the chosen daemon, or print status for all daemons if no target is specified

     start	   enable and start the chosen daemon, or start all enabled daemons if no target is specified

     stop	   disable and stop the chosen daemon, or stop all daemons if no target is specified

     restart	   stop and then enable and start the chosen daemon, or stop all daemons and then start all enabled daemons if no target is speci-
		   fied

RETURN VALUES

     0		   completed succesfully

     1		   an error occurred

FILES

     /usr/libexec/xgrid/xgridagentd
	     agent daemon

     /usr/libexec/xgrid/xgridcontrollerd
	     controller daemon

     /System/Library/LaunchDaemons/com.apple.xgridagentd.plist
	     agent launchd control file

     /System/Library/LaunchDaemons/com.apple.xgridcontrollerd.plist
	     controller launchd control file

EXAMPLES

     Print status of agent and controller:

	   $ xgridctl status

     Start the controller and set it to run at startup:

	   $ xgridctl controller start

     Stop the agent and set it to not run at startup:

	   $ xgridctl agent stop

SEE ALSO

     xgrid(1) launchd(8)

HISTORY

     This program was first introduced in Mac OS X 10.4 "Tiger".  It was inspired by apachectl(8).  The "on" and "off" actions were deprecated in
     Mac OS X 10.5 "Leopard".

BUGS

     Bug reports can be sent to bugreport.apple.com

Mac OS X							   April 2, 2009							  Mac OS X

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