-
Blank screen
- Stage A1
- Computer sends power to logic board, power-on self test (POST)
- (Chime if successful)
-
Blank Gray Screen
- Stage A2
- EFI loads boot loader
-
Gray Apple
- Stage B1
- Boot loader boot.efi loads kernel and boot-required kexts
-
Gray apple + gear
- Stage B2
- Kernel looks for root device and its driver checks disk directory, and runs the "launched process"
-
Blue screen
- Stage B3
- The "loginwindow" process starts which requires WindowServer; other "launched" jobs and processors run, mostly in parallel
-
Welcome to Mac OS X progress window
- Stage B3.5
- Previous versions of Mac OS X display a progress window
- (Leopard and Snow leopard do not display this Window)
-
If automatic login is disabled, you see the login window
- Stage B4
- Login Window Starts
-
Desktop, Dock, and menu bar
- Stage C1
- Finder, Dock, and other background processes load
-
Item specific onscreen elements
- Stage C2
- Login items run
- (Some login items do not display onscreen elements)
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