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harryb2448

 
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Member Since: Nov 28, 2007
Location: Nambucca Heads Australia
Posts: 16,851
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Mac Specs: iMac i5 2.7GHz OS X.9.4

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Macs are like time when it comes to installing an OS older than they are. You cannot go backwards. Inadequate or no drivers. Mac Pro 1.1 was released with OS X.4.7 and that is as far back as they can go.

Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!
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