I have a 2007 24" iMac and a 2008 24" iMac. The 2007 is loaded with all my current working apps and data. I want to take the hard drive out of the 2007 and move it to the 2008. I know if I tried to do this with Windows I would have to reinstall the operating system due to differences in motherboard, etc. Do I need to do anything special to move drives between imacs or will it just start up and go? Thanks!