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  1. #1
    aussiemac
    Guest
    Unhappy iMac startup problems
    Hi

    I've got myself into a sticky situation, hope someone out there can help.

    I was trying to install OSX over OS8.6 on a tray-loading G3 iMac. I hadn't updated the firmware (stupid I know - now!) and although OSX worked fine the first few times I rebooted or switched between it and OS8.6, now I get the white command screen prompt on startup. The problem is that I had told the computer to startup from an iMac 'Restore' CD which doesn't boot up to the desktop but only the the point at which you can elect to erase the HD (not an option at present) or restart - back to square 1. Inserting another CD and attempting to restart just ends up with a broken folder icon.

    Can anyone assist me in advising what code/s I need to input at the prompt to be able to boot from another CD or to force it to boot from 8.6 or OSX? Or if there's a way to update the firmware from the command prompt?

    Any assistance gratefully welcomed.

    Regards

    'aussiemac'

  2. #2


    Member Since
    Jul 22, 2003
    Location
    Hamilton College
    Posts
    6,999
    Specs:
    20" iMac C2D 2.16ghz, 13" MacBook 2.0ghz, 60gb iPod vid, 1gb nano
    When you boot up the computer hold down C so that it will boot to the CD
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  3. #3
    aussiemac
    Guest
    Been there, doesn't help. Because I get the white screen when I reboot, it seems to default to that screen rather than allowing me to force it to start up using the usual workarounds (like holding down 'c', Shift or whatever). So I really need a command I can type at the prompt to get it to achieve the same result as holding down 'c'.

  4. #4
    aussiemac
    Guest
    Further to my last, does anyone know whether performing the Open Firmware command:
    > reset-all

    will reset the nominated startup volume back to the HD?

    aussiemac

  5. #5

    cradom's Avatar
    Member Since
    Feb 14, 2004
    Location
    Groves, Texas
    Posts
    4,561
    Specs:
    21in. iMac 10.11 --- HP Linux Mint 18
    First off, OS X doesn't play well with 8.x. You need to upgrade to 9.2.2. (or at least 9.1)
    Have you tried resetting the PRAM?
    If you can get to the finder, do the firmware upgrade!!

  6. #6
    aussiemac
    Guest
    ...And therein lies the problem - I can't get to the Finder, because I had set the 'startup disc' to be a CD which goes straight to an 'erase HD or restart' window rather than the Desktop.

    If I'd thought about it in more detail (and read a few forums beforehand!) I would have dumped the contents of the HD onto an external HD or other computer, and done a clean install from scratch which would have included 9.2 and OSX.

    I have tried the PRAM reset (using the Open Firmware command line) without any effect.

  7. #7

    cradom's Avatar
    Member Since
    Feb 14, 2004
    Location
    Groves, Texas
    Posts
    4,561
    Specs:
    21in. iMac 10.11 --- HP Linux Mint 18
    Reset the PRAM by restarting and holding down cmd-opt-p-r.
    Let it chime at least three times before letting up.
    Do you have an install cd? (not restore) for OS 9? You need at least 9 to update the firmware.
    Try booting to it holding the c key. If that doesn't work try holding cmd-shift-opt-del.
    Worst case, open it up and press the cuda switch (reset on motherboard) once.
    Also, how old is the battery?

  8. #8
    aussiemac
    Guest
    Cool iMac Startup problems - resolved!
    Well, I have fixed the problem.

    Fix involved:
    Unplugging the iMac for 24 hours.
    Turning on the iMac (back to the Open Firmware screen).
    Typing:
    >reset-nvram (ok)
    >set-defaults (ok)
    >reset-all

    This then allowed me to reboot into OS8.6, at which point I ran the Firmware update, clean-installed 9.2 and I'm now back in business :cool:

    Thanks for the assistance.

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