Therefore, if your Mac is constantly rebooting after displaying the Apple logo, then there might be a problem with the kernel extensions that is preventing the system from booting properly. Once the OS X kernel loads properly, even if there is a problem with background services, the computer will still boot but will just display unwanted behavior such as location services or Spotlight not functioning. In some instances, after crashes, power outages, or changes are made to the system, instead of booting properly the system might display the Apple logo and then reboot, repeating over and over. When you start up your Mac, the system will generally show a gray Apple logo for a brief period followed by the log-in screen or other user interface elements as the rest of the operating system loads.
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