Hey everyone, I'm new to this forum and I would greatly appreciate any help you can lend me on this swap. I recently recieved an iMac g5 (20") and I am trying to use an old 40 gig hard drive from my first mac mini which is a g4. I have it set up externally via USB and the drive has os 10.4 with my old files. When I boot up the Imac with a os 10.5 install disk it says that it cannot be installed on this mac, I am not too conscerned with upgrading to 10.5 but more with booting from this extrernal drive in an attempt to keep my old files. I'm not sure what steps to take to teach the iMac to boot from this external drive. Also the iMac has no internal hard drive and when I boot without the install disk I only get the flashing folder/ question mark... Thanks for any help you can provide!!