1. Welcome to the new MacRumors forums. See our announcement and read our FAQ

Help with installing Leopard on iMac G4 800MHz 10.4.11

Discussion in 'PowerPC Macs' started by Pilopew, May 30, 2010.

  1. macrumors member


    A few months ago, I bought a new iMac 3.06 Intel etc.
    Now, my poor little G4 was just standing there. After a lot of fumbling around, restores, it finally has regained life, running Tiger etc.
    Now, I wanted to install Leopard, see for myself what I would prefer, and it would allow to tether wireless internet connection through my iPhone to the G4. But I need Leopard for that, Tiger is too old.
    So, after Googling, I found out that if I put my Intel into Target Disk mode, I could use it as external DVD reader, seeing my G4's reader is dead as dead can be.
    So I messed around etc, tried to use LeopardAssis, but no luck. I came accross this article here: http://lowendmac.com/osx/leopard/unsupported.html
    Somewhere, under the header "Using a Supported Mac" there were a few explanations about how to do this with another mac at your disposition. It's something to do with external Harddrives and Firewires and partitions, but I didn't understand them, to be honest. I do have external Firewire drives aswell though.
    Could anyone clear the instructions up for me, or post an alternative way? I am aware of the "Open Firmware tricking techniques" and modifying the OSInstall.mpkg packages etc, but the downloads were down, and I am not thàt at ease with Terminal etc.

  2. macrumors 6502a

    if you want i can mod the osinstall.mpkg for you later tonight
  3. macrumors member


    Yes please, thanks, thatd be nice. Ill look up again how to work that. Would you by any chance know what the part of the article I mentioned was all about?
  4. macrumors 6502a

    i might not get to do it for a few days
  5. macrumors member


    Ok, that's cool, thanks for the effort. Would anyone else know how the other methods would work?

  6. macrumors 68020


    Best thing to do as you will need an optical drive at some point anyway is just buy a new dvd drive for 20-30 bucks and install it yourself. I strongly recommend a Pioneer or LG as both work 100% with the built-in drivers.

    Here is a guide on how to take the imac apart and replace/upgrade ram, hard drive and dvd drive: http://www.xlr8yourmac.com/systems/imac_g4/imacg4_takeapart.html

    Once you do that follow this guide on how to install 10.5 on unsupported macs: http://lowendmac.com/osx/leopard/unsupported.html

    Since your 800MHz is so close to the 867 minimum and it seems like you won't be doing much on it the performance will be decent.
  7. macrumors member

    Great, could you explain to me the part in that guide under the header "Using a Supported Mac"? It was too cryptical for me.

  8. macrumors 68040


    Since 10.4 ANY optical drive works with default OS X drivers.
    OP, just grab one which reads DL discs (Leopard is on DL). You will also need BOX (retail) copy of 10.5 install DVD. Dedicated one (gray disks) will not work, it's all Intel only and contains no PPC code.

    To fake out Leo installer, use OF method (i copied it for you from: http://lowendmac.com/osx/leopard/openfirmware.html):

    1. Reboot your Mac and hold down the Cmd-Opt-O-F keys until you get a white screen with black text. This is the Open Firmware prompt.

    2. Insert the Mac OS X Leopard Install DVD.

    3. Type the following lines exactly as shown below into the Open Firmware prompt. Be mindful of capitalization, spaces, zeros, etc. If the command is properly typed and understood, Open Firmware will display "ok" at the end of each line after you hit "return". What these lines do is set the CPU speed reported by Open Firmware to OS X as an 867 MHz G4 processor system. They then continue the boot from the DVD drive.

    For single CPUs, use the following three lines:

    dev /cpus/PowerPC,G4@0
    d# 867000000 encode-int " clock-frequency" property
    boot cd:,\\:tbxi

    4. Continue the install normally.

    5. This CPU setting is only in effect until the Mac reboots. Once OS X Leopard is installed and your Mac has rebooted, the proper CPU speed should once again be displayed when you select About This Mac under the Apple menu.

    That's all you need to do.
  9. macrumors member

    Crap, whar do I get non-gray CDs from. Damn, thatll be another search for the BOX version I guess. Don't think that's worth it, I'm not willing to invest money in the upgrade. Then leave it like that, or try with the modded OSInstall.mpkg then. Thanks for all the help though! :)
  10. macrumors 6502a

    this is the modded osinstall.mpkg, it should run on g4's from 502mhz and up, so it should work with you 800mhz imac, do you know how to put it into the disc image (remember to unzip he file first)

    Attached Files:

  11. macrumors member

    Ok, thanks a bunch! Ill look up the tutorial on working with the modified OSInstall, it was somewhere here I think, Ill find it.
    Shall I post back here if it works(or not)?

  12. macrumors 6502a

    post back here if it works(or not)
  13. macrumors member



    Epic win here, thanks to max¥¥, thank you sooo much. I just copied to external, replaced the package, and BOOM! :D
    By the way, would you know why for this installing, I didn't need the second Leopard CD?

    Cheers anyways, ITS ALIVE
  14. macrumors 68040


    You probably not checked any additional software to install (iLife etc).

    BTW, if it works with your gray Intel dedicated disks, it means that there is full install for both architectures (PPC and Intel). So, it's my bad. I've always thought that dedicated install disks contains only specific architecture OS version.
    Good to know for the future ;)
  15. macrumors member

    Thats cool :)
    I indeed do not seem to have iLife installed, oh noes. Oh well, I'll take care of that later, atm I'm busy doing updates etc etc.
    Thanks for the help though :)
  16. macrumors 6502a

    I'm happy to help

    Edit: it probably didn't install Ilife as the osinstall.mpkg was made from my retail leopard disc witch dosn't include Ilife
  17. macrumors 68040

    As an aside, that is totally untrue. Yes, a grey install DVD will only install on the Mac that shipped with the DVD but that OS will run just fine on a PowerPC Mac once it's been installed.
  18. macrumors 68040


    Huh, to be exact, this what you were that kind to quote, is PARTIALLY untrue ;)
    That's why i wrote this after:

  19. macrumors 6502a

    just to clear up some confusion, the gray disks may well only install on intel, but it is only told it can't do that by the osinstall.mpkg, the osinstall.mpkg i used was from my retail disk so it is told it can install on ppc or intel
  20. macrumors newbie

    Question to max¥¥

    Hi max¥¥,
    is it possible to do something similar for installing the ILife08 to a G3 800 MHZ ? I am looking to have the iphoto08 running on the G3. thanks in advance
  21. macrumors member

    I have used LeopardAssist for it.
  22. macrumors newbie

    Hi all

    I have an Hi i have an Apple Power Mac G4 Desktop M8493 (January, 2002) - 250GB HDD. It has no operating system on it tho. I have an original OS X snow leopard disc however. The disc is in to the machine but nothing's happening.

    Can you help

    Btw it's dual processor
  23. macrumors P6


    This was answered in your other thread. Snow Leopard is an Intell only operating system. It will not work on PowerPC Macs. You need Tiger or Leopard.

Share This Page