I have been trying for weeks to install Mac OS X Snow Leopard on my iMac Late 2006. I have been having trouble lately due to the installation saying that Mac OS X cannot be installed, although I have installed this version of Mac OS before. I have been following this guide listed below and was able to install OS X Snow Leopard before. I have gone into Terminal via the install disc and attempted to enable root privileges, but it says "-bash: su: command not found". Any help would be appreciated, and thanks in advance.