Can't install Leopard on a blank partition

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I just bought a new iMac with Lion installed. I partitioned the 1TB drive into two separate parti ions. My computer won't let me install Leopard onto the new partition. Also, I have an external drive with Leopard installed on it. When I go to System Preferences and change the startup disk option to my external drive and then hit restart, my computer tries to restart , then freezes with an error message that I need to restart my computer.
Any ideas on how I can get Leopard installed onto the second partition of my hard drive? Or does Lion prohibit that for some reason?
 

chscag

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Your Mac's Specs
2017 27" iMac, 10.5" iPad Pro, iPhone 8, iPhone 11, iPhone 12 Mini, Numerous iPods, Monterey
The only version of OS X you can run on your new iMac is Lion. Neither Leopard nor any other version of OS X will run on that machine. Go back into Disk Utility and partition your hard drive as single partition again. You can do that by booting to the Recovery partition and running DU from there. Make sure you backup your data first.
 

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