Are you installing on the IDE drive? I had that issue while trying to test it out on an old IDE drive. I would up just making a CCC image of my 10.5.8 install on my 1 TB Sata drive and nuking it. Installed SL on the SATA drive and have had no issues, up and running since last Thursday. Used this guide http://www.infinitemac.com/f57/how-t...-on-p5k-t3380/ Good Luck!