| Keystroke | Description |
| X | Start OS X in Forced Mode |
| ⌥ + ⌘ + ⇧ + DEL | Bypass primary startup volume and seek a different startup volume (such as a CD or external disk). |
| C | Start up from a CD that has a system folder. |
| N | Attempt to start up from a compatible network server (NetBoot). |
| R | Force PowerBook screen reset. |
| T | Start up in FireWire Target Disk Mode. |
| Start up in Safe Boot Mode. Temporarily disable login items and non-essential kernel extension files (Mac OS X 10.2 and later). | |
| ⇧ | (held until second restart) Boots into “Safe Boot” mode, which runs Disk First Aid. The system will restart on completion. |
| ⌘ + V | Start up in Verbose Mode. |
| ⌘ + S | Start up in Single-User Mode. The results in UNIX command line. |
| Boot into Open Firmware.Select a boot device. | |
| ⌘ + ⌥ + P + R | Reset Parameter RAM (PRAM) and non-volatile RAM (NVRAM). |
| (mouse button clicked and held) | Eject (internal) removable media. |