I have a retail version of 10.5 Leopard that I have tried installing onto my PowerBook, but for some reason it never seems to install correctly. Long story short, the last time I tried to do this install I ended up getting the dreaded folder with blinking question mark. As a result, I did an erase & install with my original 10.4 Tiger disk and the PB is up and running just fine. I would like to install 10.5, and hopefully get it right this time, but I am at a loss for why a process I have done countless times continues to fail. Can anyone shed some light on this and offer up suggestions?