So I promised to report back when I finally install the Leopard on my Cube. Yesterday I bought a new hard drive as DiskWarrior seemed to report bad block and general access problems on my Cube drive when mounted in target disk mode. I have put the new disk in, and when I tried to format it, Disk utility would refuse and report an input/output error. Tired various things and jumper settings with no luck. Finally I've put the new disk in the external firewire box, and that way I had no problems formatting and installing it. Finally I have put the disk in the Cube and it booted fine. The only problem I noticed so far is that the application for my Skype phone no longer works. So to summarize: - the old hard drive was not broken (but I'm glad i replaced it as it was more than 4 years in service) - for whatever reason my Cube seems to have problems when mounted in the target disk mode although the firewire port works fine with external devices There, hopefully this info will be of some use to someone.