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The Macintosh startup sequence for Apple Macintosh computers, or Macs, includes hardware tests and diagnostics which can trigger the startup chimes or other indications of startup success or failure. The startup sequence provides auditory and visual symbols of the computer's status and condition as it powers up, providing users with immediate feedback on the machine's soundness. Additionally, they allow the user to quickly identify any potential problems and take any appropriate actions to rectify faults.
A Workgroup Server 8150 showing a loading screen while starting up at Bowling Green State University.
A 2006 iMac displaying the Apple logo in gray in the midst of booting the computer.
Two Mac computers, Old World and New World respectively, in the process of starting up the system in different styles.