I folowed the instructions for fsck, but no luck.
I managed to start in 'safe mode' and then change the permissions on the 'Visitor' account. The Visitor account was OK. From there I repaired persmissions. I switched off and returned, still no hard drive. I went back in to the Visitor account...
I have G4 Power Mac, running OSX version 10.3. My technical expertise is not great, so please be as simple as you can!
After the weekend, in which a visitor used the 'visitor' user account, I now cannot access my own account. the 'visitor' account is all right. Not sure if the two events are...