Relocation of Snow Leopard on an iMac Mid-2011

I recently bought a used iMac for my daughter (27 mid-2011 "Core i7, 3.4 GHz) who's been upgraded to El Capitan. I want to set up as a dual-boot machine, with a small Snow Leopard partition so that it can run some old but still useful PowerPC under Rosetta software. (Snow Leopard is the operating system provided with this iMac, so there should be no material inconsistency.) I have not received no installer discs with the iMac, but have an installer for Snow Leopard DVD I bought for updating an iMac of 2006 now-dead Leopard.

When I insert the DVD, the installation icon has an 'X' through it and will not start, and the Setup icon is dimmed in the System Preferences/Startup Disk window. If I try to start the iMac from the installation disc, I get a kernel panic and do a forced shutdown. I'm guessing that El Capitan (and probably earlier who succeeded Snow Leopard) defines something in the PRAM or elsewhere which prevents the installation of an older operating system. Further, I guess the only way to get around this is to reformat the discs (it has a HD and SSD) and start with Snow Leopard on a machine "blank." (Other that the hassle, I have no problem doing this, as I still customize Mac.)

Someone can confirm this conjecture, or suggest a simpler approach?

TX,

Ken Henningsen

Apples are animals different from Windows systems.  Machines designed for a version of the operating system cannot run a version prior to the exception in a virtual machine.

My * early *-2011 MBP came with 10.6.7, but the "detail disk" is 10.6.3.  My machine cannot boot from the drive of retail.

Please call 1-800-APL-CARE, give them (not us in the free gallery) serial number, pay $20 for processing or shipping to get copies of the original installation discs.

Tags: Mac OS & System Software

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