Intel-based Mac: Startup sequence and error codes, symbols
The following is an overview of the startup sequence, error conditions, and behaviors for all Intel-based Macintosh systems.
Note that some newer Macintosh models only use tones to indicate error conditions. See this article for more information.
Mac Pro, Mac mini (Early 2006), Mac mini (Late 2006), Mac mini (Mid 2007), MacBook, MacBook Air, MacBook Pro, iMac (17-inch, Late 2006 CD), iMac (17-inch, Late 2006), iMac (20-inch Late 2006), iMac (20-inch, Early 2008), iMac (20-inch, Mid 2007), iMac (24-inch Mid 2007), iMac (24-inch, Early 2008), iMac (24-inch, Late 2006), iMac (Early 2006 17-inch), iMac (Early 2006 20-inch), iMac (Mid 2006 17-inch)
|Startup Sequence stage||Event|
|Power On||Boot-ROM/RAM check is initialized|
|kernel||Grey screen with Metallic Apple and spinning gear|
|loginwindow||Login window appears|
|User Environment Setup||The text "Logging in..." appears in login window along with a progress bar. Upon successful login, the Desktop and Dock appear.|
Learn more about trouble shooting on Mac OS X's startup process.