OK - I have a MA456LL/A late 2006 imac 24" core 2 duo machine. Got it without a hard drive, popped one in. Problem I am having is I cannot get past the circle slash screen when trying to install OS X. I read on here that the most common reason for this is trying to install a copy that the machine cannot run but the acceptable range for this machine is Tiger 10.4.7 which supposedly came on it and up a few versions. I have tried over 5 versions but cannot get past this. Any ideas? Otherwise, the machine works fine, it will boot a linux distro dvd no problem.