MacOS startup key combination reference
From Wikistix
Various keys do magical things during MacOS boot
| Key combo | Operation |
|---|---|
| Option | Invoke Startup Manager |
| T | Target Disk Mode |
| Shift-Control-Option | Reset the SMC |
| Command-Option-P-R | Reset NVRAM |
| Shift | Safe Mode |
| Command-R | Recovery Mode |
| D | Apple Diagnostics |
| Command-V | Verbose Mode |
| Command-S | Single-User Mode |
| C | Boot from Removable Media |
| Eject, F12 | Eject All Removable Media |
| N | NetBoot |
| X | Force a Boot into OS X, instead of Classic |
