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10.5: Install Leopard on an older Mac Install
If you are like me, you have several Macs about the house, both old and new. I was a little disappointed that my old G4 800 tower did not meet the install requirements for Leopard.

However, there is a workaround. I installed Leopard on a machine that met the requirements to a FireWire drive. When the install finished, I shut down the installer machine and put the drive back in the 800MHz G4. Voila, it booted right up and finished the setup; it worked like a charm. Leopard also seems to run faster than Tiger did. So I will get a little more life out of the old beast still.

[robg adds: This may be an alternative to this more technical method.]
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10.5: Install Leopard on an older Mac | 14 comments | Create New Account
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10.5: Install Leopard on an older Mac
Authored by: jcbeckman on Nov 08, '07 07:55:33AM

Why not just put the older Mac into FireWire Target Disk mode and use it as the external FW drive?



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10.5: Install Leopard on an older Mac
Authored by: JeffreyHL on Nov 08, '07 08:21:58AM

Well on my G4 that is a problem. The onboard firewire quit working a few years ago and the PCI firewire card drivers don't load in target mode. But yes that would be the preferred way, you are correct.




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10.5: Install Leopard on an older Mac
Authored by: mockingburt on Nov 29, '08 01:38:18PM

Just in case someone is still wondering if this is actually working: I've just installed Leopard successfully on a G4 800 MHz iBook (1.12 GB RAM).

I simply started it holding the T key in order to run it in FireWire target disk mode.
Then I installed Leopard from my G4 Dual 1.45 GHz PowerMac on the iBook's volume. It worked flawlessly.

After I restarted the iBook System Update also run without any troubles. 10.5.5 and all current updates are installed and the iBook is working like a charm.



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10.5: Install Leopard on an older Mac
Authored by: christian.v on Nov 08, '07 09:05:42AM
If you try to install it on an iMac G4 800 Mhz, watch out for the "wake up from sleep" problem. The NVidia GeForce2 MX card seems to be to weak for Leopard.

http://forum.insanelymac.com/index.php?showtopic=69135&pid=492042&st=0&#entry492042

http://discussions.apple.com/thread.jspa?messageID=5755829&#5755829


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10.5: Install Leopard on an older Mac
Authored by: chrisjniles on Nov 08, '07 10:52:59AM

I used a similar method to get Leopard onto my wife's 800 MHz iBook.

1. Use SuperDuper! to make a clone the iBook hard drive on an external Firewire HD (that way if anything goes wrong I can take the iBook back to Tiger without loosing a thing)
2. Fresh install of Leopard on my MacBook (erase and install), with a recent Time Machine backup from which I could restore all my files.
3. Start up the iBook from the external HD and the MacBook in Firewire target disk mode.
4. Use SuperDuper! to clone the MacBook internal HD to the iBook internal HD
5. Use the Time Machine backup to restore the MacBook to its original state and the Tiger clone on the Fire Wire HD and Migration Assistant to get all of my wife's data onto the internal HD of her iBook, now running Leopard.

We have three external HDs, one for my MacBook and two for her iBook, one for Time Machine and her iTunes media (her iBook only has a 30GB internal) and the other still has the Tiger clone so that if she wants to she can revert back to Tiger.

All of this took about a full day, but as of right now everything is running great. And if something doesn't work well we can always go back to the way it was.



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10.5: Install Leopard on an older Mac
Authored by: jimusair1 on Nov 08, '07 01:36:30PM

I installed Leopard with a clean erase and install on my G4 emac and my G4 powerbook. Both did meet the requirements, but Leopard just runs way faster than Tiger. And like you said, I can get another 3-4 years good use out of both. Why it is faster I don't know, as I understand Leopard was really designed for the Intel Macs which performs beautifully on my Mackbook too.
Jim



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10.5: Install Leopard on an older Mac
Authored by: magnamous on Nov 08, '07 06:45:32PM

Just FYI for anyone interested: I installed 10.5 onto a firewire drive using a supported G4 machine, and then tried to boot my Pismo (G3) off of the firewire drive. It kernel panicked before the little spinny thing showed up on the initial boot screen. Also tried booting a G3 iBook off of the same firewire drive. It showed the spinny thing, but then had a "silent" kernel panic (no kernel panic screen - it just never stopped spinning).



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10.5: Install Leopard on an older Mac
Authored by: baltwo on Nov 08, '07 08:55:15PM
Doing that using the upgrade or A&I installation option on top of a Tiger installation, usually results in a prohibitory sign when trying to boot an unsupported Mac; at least that's what I found during beta-testing. Doing an Erase & Install from a supported Mac onto a FWHD and then using the Migration Assistant to transfer from the Tiger installation worked.

WRT to the noted hack and this one, http://blog.kupferman.net/?p=3, which I think is easier, if you don't modify the OSInstall.mpkg, then you won't be able to use it to run the Utilities, do an A&I installation, etc. Do the hack to a restored install disk on another volume or external HD.

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10.5: Install Leopard on an older Mac
Authored by: tomem on Nov 12, '07 04:20:00PM

Tried this with a USB2 drive but no go. At first the installer wanted me to change to Apple File Partition, which I did, but then it still would not allow install on the freshly partitioned drive, with no diagnostics offered.

Is this prohibited? I was using the USB2 drive on a 1.6 GHz iMac (non-Intel).

---
TomEM
Crofton, MD



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10.5: Install Leopard on an older Mac
Authored by: stevehops on Nov 16, '07 07:29:58AM
10.5: Install Leopard on an older Mac
Authored by: jcioccio on Jan 01, '08 09:31:04PM

I'd like to use the "firewire drive method." I plan to take my drive and DVD over to a friend's house to load Leopard on my drive. His machine is already running Leopard. I'll then plug the drive back into my desktop firewire port and select it as the start up drive. Will this work or will I need to remove the drive from the firewire case and physically place it into the desktop?



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10.5: Install Leopard on an older Mac
Authored by: momcat2 on Feb 21, '08 11:07:55PM

I tried to install Leopard on my power mac G4. It meets all the minimum requirements. But, when the install was done at the restart all I got was a frozen grey screen. After forcing the computer off by the power button and restarting, I got a grey screen again. I tried re-installing and got the same result. Has anyone had this problem before? Does any one have a solution? It would be nice to have Leopard on all my machines.



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10.5: Install Leopard on an older Mac
Authored by: mockingburt on Nov 29, '08 01:41:57PM

Just in case someone is still wondering if this is actually working: I've just installed Leopard successfully on a G4 800 MHz iBook (1.12 GB RAM).

I simply started it holding the T key in order to run it in FireWire target disk mode.
Then I installed Leopard from my G4 Dual 1.45 GHz PowerMac on the iBook's volume. It worked flawlessly.

After I restarted the iBook System Update also run without any troubles. 10.5.5 and all current updates are installed and the iBook is working like a charm.



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10.5: Install Leopard on an older Mac
Authored by: Anonymous on Feb 05, '10 03:36:08PM

Can I use the installer disc for one of my iMacs, put the iBook G4 in firewire disc mode and install?

My iMacs are intel and the ibook is a single core G4 power PC with a 1.07 GHz chip



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