HT1544: Installing Mac OS X 10.5 Leopard
Learn about Installing Mac OS X 10.5 Leopard
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Helpful answers
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Apr 21, 2012 8:44 AM in response to katietylerby John Galt,The maximum OS version you can run is a function of your iMac's limitations. Find out what model it is by going to > About this Mac, and click "More Info..." The hardware identifier is one of the first entries under "Hardware Overview".