Simple as.. is this possible? I have been given an iMac by my father in law who has lost the original set of recovery disks that came with the system. When I took the iMac, I wanted to format with the new Snow Leopard upgrade, but could not work out how to do this (being new to Macs!). Does anyone know if it is possible to re-format an iMacs hard disk without the original recovery disks, but with the Snow Leopard upgrade disk instead? Thanks in aniticpation!