reformatted iMac OS installation

I recently updated my iMac 27 inch end 2015 model.  I have transferred all my files, programs, etc. of my iMac mid-2007 and now need to reformat the disk on the old drive and install Snow Leopard (it's the last OS I have on the drive).  If possible, I then will modernize it to the Mavericks - the last OS that actually worked on this computer.  I made the mistake to upgrade to El Capitan and had nothing but restarts, freezes, the beach ball of death, etc., which hastened to my upgrade.  My question is, how to reformat the hard drive (I assume from the Snow Leopard disc) and then install the OS on that drive.  I've never done this before and I just want to check that it works before giving it to our daughter.

While it is started on the DVD, open disk utility, select all of the disk in the sidebar, erase it and run the Setup program.

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Tags: Mac OS & System Software

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