Can't install Leopard 10.5.6 onto Power Mac G5 with Mac OS 10.2.7

I have a Power Mac G5 with Mac OS 10.2.7 and can't seem to install Leopard 10.5.6. Every time i try to install it it either says that it can not validate the contents of the Base System package or could not validate the contents of the Xll User package. If i could get suggestions on what i can try to install Leopard on to my mac G5.

Make sure it is a retail disc, as indicated here: https://discussions.apple.com/docs/DOC-2275 Make sure you understand the difference between Archive and Install and Upgrade and install here, and erase and install: https://discussions.apple.com/docs/DOC-2209 Make sure your data is backed up before you proceed: https://discussions.apple.com/docs/DOC-1992 Decide if you need access to Classic before you proceed, as it is gone with 10.5.

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Any sugestions?!
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+Just got off the phone with apple support, because I had the same problem. What the problem is here is that the installer looks at the System Profiler to gather this information to make sure that it meets the requirements. Since these upgrades are not yet supported it reads 0mhz processor speed, if it's under 867mhz, it won't install.+
That's is my problem to start with!
I have 2 internal 120GB HD's, the one set as a master runs Tiger and the one set as a slave
have 4 partitions of which 3 partitions are running OS9, Panther, Tiger
and one partition I left to install Leopard.
When I try to install Leopard a pop up window comes
telling me that I can't install it on this computer,
utilities of the Installation disc will read 0MHz.
Try booting from a "virgin" Tiger, just bare OS on the separate drive and partition,
same thing will happened.
some solutions I find @ XLR8 :
[URL] http://www.xlr8yourmac.com/feedback/OSX_Leopard_feedbacktips.html#storytop
But, no joy, just yet.
Never give up!!!
Yes, processor upgrade is not from Apple, but Apple should be more helpful.
If somebody who had a luck with straight install, can put some words of to this post.

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Since it seems my hard drive has totally bit the dust, can I install Leopard on the external drive I use for Time Machine, and run my desktop from that drive? Could I run it from an external drive totally dedicated to Leopard? I am buying a new desktop soon, but I need info off of this machine. Can I plug in my Time Machine drive to my laptop and be able to use it without losing data?

Elizabeth Salcido wrote:
Thanks so much.
Youa re welcome!
I figured I would have to use a second drive. At least when I get my new desktop I will have a drive for Time Machine for both desktop and laptop.
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Hello & a warm welcome!
Yes you can, but 10.6 would be cheaper...
Leopard requirements/10.5.x...
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minimum system requirements
    * 512MB of memory (I say 1.5GB for PPC at least, 2-3GB minimum for IntelMacs)
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    * 9GB of available disk space (I say 30GB at least)
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May be available from Apple again, or not...
https://discussions.apple.com/thread/4720126?tstart=0
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
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    * 5GB of available disk space (I say 30GB at least)
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    * Some features require a compatible Internet service provider; fees may apply.
    * Some features require Apple’s MobileMe service; fees and terms apply.
Buy Snow Leopard > http://store.apple.com/us/product/MC573/mac-os-x-106-snow-leopard
Call Apple Sales...in the US: 1-800-MY-APPLE. Or Support... 1-800-275-2273
Other countries...
http://support.apple.com/kb/HE57
It looks like they might still have it...
http://store.apple.com/us/product/MC573Z/A?fnode=MTY1NDAzOA

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Can't install Leopard 10.5.6 onto Power Mac G5 with Mac OS 10.2.7

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