I have two macs: an old (2009 I think) iMac running Snow Leopard/10.6.8, and a new (late 2011) iMac running Mountain Lion. I want to keep my old system as is, but move it to the new computer for faster speeds. In other words, I want to downgrade the 10.8 computer to 10.6.8 and clone my old iMac onto the new one. I was able to erase the new mac's hard drive, but I can't seem to downgrade it since it won't boot off the Snow Leopard disk (I get a kernel panic). Any help would be greatly appreciated. (edit) Just to clarify, I do not want to upgrade my old iMac to Mountain Lion — I find Snow Leopard to be by far the better operating system. But that discussion's for another day.