So, I picked up an early 2006 iMac for nothing that I want to use for my cabin but without iCloud, it is useless to me. I upgraded the RAM to 2GB and swapped out the processor to a 1.86 Core 2 duo that came in some late 2006 iMacs. The computer is upgraded to the minimum specs for Lion. I installed snow leopard without problems so I wouls have the App store. The app store tells me that I cannot install lion on my machine because it it too old. So I had a brilliant Idea - install Lion on a hard drive in a USB cradle with a brand new iMac then use that drive to install into my 2006 imac and boot from there. I tested in in the cradle first and set the computer to boot from the USB drive and I get a "no" symbol where the Apple logo should be during start-up. I am now at my whits end and ready to give up. I know others are successfully running Lion on upgraded early 2006 iMacs. I have the Core 2 Duo CPU, 2GB RAM and is running 64 bit. any suggestions or am I just out of luck? I am positive I read a post in a forum awhile back on how someone pulled it off. I really want this thing to work, so any help is very much appreciated. thank you.