I just replaced my new iMac 27" 3.2GHz with a BRAND new iMac 27" 2.7GHz QuadCore i5. I have everything transferred over that I need. How do I wipe the "old" iMac clean for shipping back to Apple?
Use the Disk Utility on its original disks to erase the hard drive. You may then want to install an OS.
Retrieving data ...