I've searched around and haven't found anyone with the exact same scenario. I have an iMac G4 17" that has a failed internal HD, as evidence by clicking and confirmed by an error code after running the Hardware Test CD. Ultimately, I'd like to replace the internal HD. In the mean time, I would like to see if it is possible to load OSX on an external drive (I have an unused WD My Passport for Mac 500GB USB) and boot the iMac from that. I have the original Software Install and Restore DVD with 10.2.3. While restarting and holding down C with the DVD in the optical drive, I get no options. I hear the start-up chime and eventually get the light grey background with the dark grey Apple in the center. Is there anyway to use the Restore DVD, load it into my Intel MBP, load OSX onto the external drive and THEN plug that external drive into the iMac to boot up? Its worth mentioning that when I insert the Restore DVD into the MBP, it makes a lot of noise while attempting to read the disc and is extremely difficult to eject. Do I have any options?