How to reinstall Mac OS 10.5.8 on my PGG4 without DVD

My 10 year old and 2 month old PowerBook G4 (12 ") is a dream machine!  I'm going to retire it soon but my wife and I use it for lots of emails and others.  Until about a month when the screen went crazy - menus turning green and opaque...  BUT now, I started in safe mode (hold down the SHIFT key) and everything is perfect - as I'm back in February 2005 and it is clear and the new...

So this must be a corrupted software problem or something, I tell myself.  So - with the original long gone, disks how can I clean this 100 GB HD and reinstall 10.5.8 Leopard (which I believe is the latest version of Mac OS that will run on the PBG4?

Can I download 10.5.8 as a dmg and then put on a USB2 external drive and I installed this drive Mountain Lion?

Not sure it will work...  I may be able to do via FireWire 400 if it will work.  But where to get a copy of the Mountain Lion (my original CD is lost or in a box in Europe...)

Thanks for your comments!


Tuesday, March 29, 2016

Mountain Lion is 10.8.x, does not work on a G4 or any Mac of PPC.

No legal way to download 10.5 Leopard install disk/DMG/ISO, sorry.

Target disk mode FireWire can work to use another optical drive to Mac to install if necessary.

Leopard requirements/10.5.x...

* Mac equipped with a processor PowerPC G5 or PowerPC G4 (867 MHz or faster) processor

Minimum system requirements

* 512 MB of memory (I say 1.5 GB for PPC at least 2 or 3 GB minimum for IntelMacs)

* DVD player for installation

* 9 GB of available disk space (at least, I say 30 GB)

Classic/OS 9 Apps is no longer supported. /.

Problem, is that apple sells more of it, check eBay and such for the version at retail, not the gray discs...

There are solutions if the 867 MHz CPU is the only hang up...


List of Applications is not Compatible with Leopard...

Tags: Mac OS & System Software

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