Leopard won't install on PPC iMac G5

Hello, I've had my iMac G5 (non-intel) since 2005. I've recently upgraded my iphone to a 4, and I want to install Leopard so I can sync with my computer. After going to all the trouble and expense to get the software, I stick it in and click upgrade. I get the language box on the restart, then preparing install, but then I just get a message that says "Mac OSX cannot be installed on this computer. The software cannot be installed on this computer."
As far as I know, my computer meets the minimum requirements for an upgrade. Any ideas?

The gray discs are machine-specific, meaning that they will only work on the models of Macs they originally shipped with. They do not have drivers and code for other Macs, meaning they are useless unless they are with the original computer or equivalent model.
If you call Apple Phone Sales (800 MY APPLE in the US), you can still order a retail version of Leopard for $129. You may be able to find a retail disc elsewhere online, but make sure it is the black disc with the big X on it, not a gray disc.

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    Was it repairing disk or permissions that kept giving different errors?
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    stratton2 wrote:
    Hi, I'm sorry if this has been answered before but I'm new to discussions and can't find it anywhere.
    I have a G4 iMac with X.3.9 and wanted to instal Leopard. The Disk made a frightful racket and stuck for hours -- had to zap the pram to get it out.
    So I tried X.4 installing as an interim and it said the installation was unsuccessful, due to and I think it said disk defect or maybe error.
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    What do I do now -- the computer works OK most of the time, though it is slow. But I have X.5 on my iBook (which is packing in for the 2nd time) and would like to have it on the iMac. Please help!
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    http://www.macmaps.com/upgradefaq.html
    Perhaps you missed one, which could fix the problem.
    - * Links to my pages may give me compensation.
    Message was edited by: a brody
    Message was edited by: a brody

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    mrc9878,
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