Blog by an Apple Certified Tech

SPECIAL COMMANDS FOR TROUBLESHOOTING MAC OS X

Few special key commands while start up. This can be of great use while troubleshooting start up issues in Mac.

Action/Explanation
Keystroke
Eject CD on boot
Hold Mouse button down immediately after powering on
OS X Safe boot
Press Shift during startup
Start up in FireWire Target Disk mode
Press T during startup
Startup from a CD
Press C during startup
Bypass primary startup volume and seek a different startup volume
Press Cmd-Opt-Shift-Delete during startup
Choose Startup disk before booting
Press Option during startup
Start up in Verbose mode
Press Cmd-V during startup
Start up in Single-User mode (command line)
Press Cmd-S during startup
Force Powerbook screen reset
Press R during startup
Force OS X startup
Press X during startup

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