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 |
Comments