Mac OS X Startup Sequence & Error Codes and Symbols
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Overview
The following is an overview of the startup sequence, error conditions, and behaviors for all Intel-based Macintosh systems.
For any other issues besides these errors and symbols, and you're still having problems starting up your Mac, please refer to http://support.apple.com/kb/TS1411?viewlocale=en_US
Error/Symbols on Start-up
Startup Sequence stage | Event |
Power On | Boot-ROM/RAM check is initialized |
BootROM-POST |
|
BootROM-EFI | Boot chime |
Boot EFI |
|
kernel | Grey screen with Metallic Apple and spinning gear |
launchd | Blue screen |
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. |