I have an old powerbook g4 (original ti model) running osx 10.3.9. Yesterday I got a "harddisk almost full" warning message although just checking the disk using command-i showed there was still quite a bit of space available (disk is 20GB). This morning on rebooting it gets as far as "starting login screen" then hangs a long time then shows a black osx "getting started" screen which runs some music then asks me to "register my product". (I don't remember ever seeing this before even when I originally installed the system). The screen asks me to give my .mac name or register for .mac or not register then press "continue". It doesn't matter which option I choose, just nothing happens, even after more than 2 hours. Same thing happens starting in safe mode. I also tried /sbin/fsck -y and got a message that it had repaired a node (?) but that hasn't solved the problem. Help please!