Hi - have recently bought 10.5 and have tried upgrading from 10.3.9 on my Dual G5 1.8GHz. I start the upgrade process, update and archive and the process gets half way (or so) through (differs each time!) and then I get a yellow warning triangle with the message, Can't write to volume, please restart and try installing again. I have tried, a clean install on my second drive and a straight upgrade on the same drive with the same results. I have also repaired the disk and permissions with the same results. In the meantime, I have done a successful clean install of 10.3 again so I can write this - but really want 10.5! Any suggestions? Thanks!