| Bypass internal drive and boot from external (or CD) | Opt-Cmd-Shift-Delete |
| Boot from CD (Apple) | C |
| Zap pRAM | CMD-OPT-P-R |
| Disable Extensions | SHIFT |
| Rebuild Desktop | CMD-OPT |
| Start without finder windows open | OPT |
| Load without extensions/control panels | SHIFT |
| Trigger extension manager at boot-up | SPACE |
| Force quadra av machines to use tv as a monitor | CMD-OPT-T-V |
| Eject Boot Floppy | Hold Down Mouse Button |
| Force boot into Mac OS 9 on beige G3 | Option |
| Force boot into Mac OS 9 on newer machines | 9 |
| Display OS selection dialog on newer machines | Option |
| Bring up dialog for shutdown/sleep/restart | POWER |
| Bring up dialog for shutdown/sleep/restart (new keyboad) | CTRL-MediaEject |
| Force current app to quit | CMD-OPT-ESC |
| Unconditionally reboot | CTRL-CMD-POWER |
| Unconditionally reboot (new keyboad) | CTRL-CMD-MediaEject |
| Force instant shutdown (new keyboard) | CTRL-OPT-CMD-MediaEject |
| Startup key combos to reset the resolution on video boards | |
|---|---|
| SuperMac (at least some models) | press and hold OPT |
| RasterOps (at least some models) | press and hold CMD-OPT-SHIFT |
| Conflict Catcher | |
| Pause Boot | P (?) |
| Launch CC at Startup | SHIFT or CAPS LOCK |