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To reproduce/debug an issue exclusive to OS X 10.5, i was trying install Leopard on my Mac Mini (model "macmini3,1", came with Snow Leopard).
However, when trying to boot from a Leopard install medium (tried both from DVD and USB stick) the machine just hangs:

  • when manually choosing the boot medium: hangs with the boot medium selection screen still displayed
  • when running the install app from Snow Leopard and letting it restart the machine: hangs with the bright grayish screen and no logo or progress indicator

Does anyone happen to know what could cause this / how to work around it?

Or could my models hardware be too new for 10.5? Although a web search suggests there were/are macmini3,1s with 10.5 running. Also, this question and it's resource suggest it should be working.

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2 Answers 2

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The usual Apple way is that a set of generic OSX disks only support all machines that come out before that OS (How would any know what a new machine might have changed). Machines released after an OS release will include boot disks that can be loaded by that machine but earlier versions might not.

Thus I suspect that your mini is unsupported for Leopard or people bought it earlier with a leopard version for that machine.

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  • Sadly it looks like this is the issue.
    – gfr
    Commented Jul 20, 2012 at 3:51
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It sounds like you are trying to boot from a Power PC version of the System on an Intel processor computer.

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  • Hm, how could i check that it is? I thought they had both PPC & Intel on the same disc? Both images i have access to exhibit the same behaviour - an unspecified retail image and the one from the developer center (only one version available there, no notes on Intel/PPC).
    – gfr
    Commented Jul 13, 2012 at 14:36
  • If I recall correctly, mounting the DVD / USB on the Desktop should give you some sort of information regarding that.
    – Thecafremo
    Commented Jul 13, 2012 at 14:51
  • The install app works fine on the machine (until the hang after restart) and the Installation readme says "Intel process or Power PC G4" required.
    – gfr
    Commented Jul 13, 2012 at 14:58
  • That gives no clue, I'm afraid. As the readme is talking about the 10.5, not that copy. I'm pretty sure this is the problem, as it happened to me once. I'll try to prove me right.
    – Thecafremo
    Commented Jul 13, 2012 at 15:09

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