Hello and thanks for reading this. Right next to me is a two month old iBook G4 12"... an hour ago, it was working well without any problems. That was before I shut it down. When I wanted to start it up again, I got the Apple logo and a few seconds later the "pretty screen of death" (the message to restart the computer in like 5 languages). On the next startup, the folder with the blinking question mark appeared. I am not new to the Mac, so I did a couple of things like holding down option, resetting the PRAM and of course Disk Utility. The HD is spinning, but this is what Disk Utility tells me: Invalid B-tree node size Invalid B-tree node size Volume check failed. Error: the underlying task reported failure on exit (-9972) Disc Utility shows the HD, but the volume on it is greyed out (not mounted), and it can't be mounted. There are some very important files on there, so if anyone can help me in any way, I would greatly appreciate it!