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A possible recovery method for a dead startup disk System
If your PowerBook G4 ends up (like mine) booting to a folder with a question mark instead of Mac OS X, and happens that you do not have a System CD with you from which to boot and fix your startup disk, here is a trick that may bring it back to normal (it did for me). It should also work for most new Macs. Boot to Open Firmware by pressing Alt+Command+O+F on boot. At the prompt, type the following two lines:
 set-defaults                            [hit Enter]
 boot hd:,SystemLibraryCoreServicesBootX [hit Enter]
Hopefully your Mac will boot to OS X or (if the trick doesn't work) to a white screen with an error signal instead of the Apple logo. Don't panic, just switch off the box and try the commands again (it actually took three tries for mine to come back). Remember to re-set your startup disk to the Mac OS X folder in the Preferences -> Startup Disk after you get running again!

If this trick doesn't make your Mac come back, you may want to go and read this document, and additionally this info on Open Firmware by Apple. Finally, this one is a quick info page for OpenFirmware, very clear and useful.

Good luck.
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A possible recovery method for a dead startup disk
Authored by: boohoo78 on Nov 28, '03 11:30:48PM

"Alt" key? What Alt key? Mine does not have one :)



[ Reply to This | # ]
OPTION KEY = ALT KEY
Authored by: richaber on Dec 06, '03 04:22:48PM

Depending on what apple keyboard you have, most say "alt" in smaller letters above "option." Therefore, when something calls for the alt key, use the option key.



[ Reply to This | # ]
A possible recovery method for a dead startup disk
Authored by: mud on Jan 02, '04 02:39:25PM

Alt = Option.



[ Reply to This | # ]
A possible recovery method for a dead startup disk
Authored by: oliverlubin on Aug 24, '04 02:01:41PM

these instructions are more clear:

(from http://www.bombich.com/mactips/openfirmware.html)

Boot into Open Firmware (OF) by holding down the Command+Option+O+F keys during startup.
2. Type "printenv" at the prompt
3. look for the boot-device setting. Write this down. Be accurate, the command line is unforgiving.
4. Type the following, assuming "mac-io/ata-4@1f000/@0:2,\\:tbxi" is your current setting:

setenv boot-device mac-io/ata-4@1f000/@0:2,\System\Library\CoreServices\BootX

then hit return. The only thing I changed was the "\\:tbxi" at the end, everything else stays the same. Also note that these are backslashes, not forward slashes!
5. Type "mac-boot"
6. Rejoice, because you're booting into X. Hopefully everyone gets to this step.
7. Now GO TO THE STARTUP DISK PREF PANE AND SET YOUR STARTUP DISK. You'll notice that it is still set to the OS 9 System Folder. That's because the GUI isn't designed to understand how we've tricked it. Just set the startup disk to your X disk. If you typed "nvram -p" in the Terminal before/after setting the startup disk, you'd see that it removes the \System\Lib... stuff and replaces it with \\:tbxi.

just saved me a hell of a lot of pain...



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A possible recovery method for a dead startup disk
Authored by: welshman on May 12, '05 01:38:29PM

I didn't get that far !
boot device is /APPL ROM

any ideas ?



[ Reply to This | # ]