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Mac OS X System Startup Shortcuts

These 9 shortcuts can be used during system startup for troubleshooting.

• Shift -> Boot in Safe Mode (turn off Kernel Extensions).
• Option -> Show startup disks
• Command + V -> Boot in Verbose Mode.
• Command + S -> Boot in Single User Mode.
• X -> Force OS X to startup.
• Option + Command + Shift + Delete -> Boot from a secondary drive, most probably a CD.
• C -> Boot from CD.
• N -> Boot from a network server.
• T -> Boot in Firewire target disk mode.