Mac OS X cannot be installed on this computer. Power Mac G5

continued from https://discussions.apple.com/message/18069601#18069601
Hi again. My power mac g5 model number is a1177 and when I put the installation disc in (Mac OS version 10.5)(AHT version 3a137)(2z691 6150 a). It loads everything and It setups to say what language you want, i say english. Then it says preparing to install. After that it says Mac OS X cannot be installed on this computer. Can anyone help me??

Leopard requirements/10.5.x...
    * Mac computer with an Intel, PowerPC G5, or PowerPC G4 (867MHz or faster) processor
minimum system requirements
    * 512MB of memory (I say 1.5GB for PPC at least, 2-3GB minimum for IntelMacs)
    * DVD drive for installation
    * 9GB of available disk space (I say 30GB at least)
Trouble is Apple no longer sells it, check eBay & such for the Retail version, not the Gray Discs...
http://www.ebay.com/sch/i.html?_nkw=mac+os+x+leopard+retail+10.5
Apple Computers Software Leopard (Full Install) 10.5
Item #:
2Z691-6150-A 1005900
Notes
Disk 1 2Z691-6150-A
Disk 2 2Z691-6023-A
Compatibility
MacBook (13-inch Late 2007)
Machine ID: MacBook3,1
http://www.welovemacs.com/2z6916150a.html

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My kit:
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I've been getting the "Mac OSX 10.6 cannot be installed on this computer" error message repeatedly whenever I try to upgrade to SnowLeopard.
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Formatted the disk and partitioned using GUID.
Resized the volume to be 130MB smaller than the partition size.
Tried booting from a USB image of SnowLeopard.
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