Startup Keystrokes
Keys to Hold Down | Effect |
|---|---|
C | Starts up from a CD or DVD |
N | Starts up from a network server |
R | Resets the laptop screen |
| Starts Recovery Mode |
T | Puts the Mac into FireWire or Thunderbolt Target Disk mode |
Option | Shows icons of all startup disks and partitions, so you can choose one for starting up. |
Shift-Option- | Starts up from external drive (or CD) |
Option- | Zaps the parameter RAM (PRAM). (Hold down until you hear the second chime.) |
| Shows Unix console messages during startup, logout, and shutdown |
| Starts up in single-user (Unix command-line) mode |
Mouse down | Ejects a stuck CD or DVD |
6 and 4 keys | Starts up in 64-bit mode |
Shift | Just after powering up: Turns off kernel extensions |
Shift | Just after logging in: Prevents Finder windows and startup items from opening. (They’ll return the next time you start up.) |
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access