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Helpful answers
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May 12, 2012 6:58 PM in response to Newkid12by stevejobsfan0123,★HelpfulLeopard (10.5) - but I believe that those disks are upgrade disks and require an OS present to install.
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May 12, 2012 7:04 PM in response to Newkid12by Limnos,Leopard's the highest you can go:
Leopard 10.5 Technical Requirements - http://support.apple.com/kb/HT3759
It isn't easy to find (certainly not from Apple), nor cheap.
Texas Mac Man, Leopard disc sources - https://discussions.apple.com/thread/3636662
"a brody" post about upgrading to Leopard - https://discussions.apple.com/thread/3373795
Call Apple Customer Support 1-800-767-2775 (telephone numbers for other countries - http://support.apple.com/kb/HE57). Provide the serial number and specifications of the Mac. They may be able to provide a replacement set of discs for a fee. These discs will be for whatever OS was installed on the computer originally, so if you have an upgraded version you will need to obtain the discs some other way.
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May 12, 2012 7:35 PM in response to stevejobsfan0123by japamac,I believe that those disks are upgrade disks and require an OS present to install.
To be precise, any retail OS X, 10.5x Leopard version can be used in a G5.
A G5 can use OS X up to 10.5.8.
For that matter, most all retail versions of OS X, 10.4x Tiger can be used in a G5. A possible exception would be a pre 10.4.2 OS X retail version in a dual core, Late 2005 G5, which would require 10.4.3 or later.
In 2003 and 2004 G5s, retail OS X, 10.3.9 Panther can be used.
Each machine has a minimum OS version which is dictated by production date.
Find out exactly what your machine is by entering the serial number here:
http://www.chipmunk.nl/klantenservice/applemodel.html
Find the minimum OS by model:
Power Macintosh G5 Models - EveryMac.com
OS X, system specific gray discs are tailored to a machine at production. Purchase of these types of discs are completely at your own risk and shouldn't be purchased without in depth research.