I can't get this iMac to boot to the live CD. It is a iMac 4.1, 2 Ghz Intel Core Duo, with ATI Radeon X1600 video . I tried the 32 bit, the 64 bit, and the 64 bit-AMD for MAcs. Can anyone point me to the proper ISO image, none of these will boot. This is a fairly old iMac, probably around 2006-07 era.