Friday, when I tried to enter my computer I have received a log screen. Tried to log but I have received this message you are unable to log in to the user account user at this time because an error occured (never happened before). I am sure that the passowrd is correct because the screen doesnt shake, like it happens when I introduce a wrong passord. Tried to reboot with "apple S" pressed to go to the root. When I acces the directory "Users" I cannot see my user name anymore. Filevault is not activated, never did it. I have very important data from work (my whole year work), I dont have backup and I must not loos it. I was not trying to do an updade or anything, it just happen when I turn on the Mac. I have tried to do the following things too: First thing: Boot from installation disk #1:Accessed Disk Utility and repaired the disk. There was one error "Mounting of the drive" that was fixed. No other errors found. When i rebooted i got the same message at the login screen. Tried to change the password. I got an error telling me that i don't have permission or an error has occurred. Did the fsck -fy: The volume Macintosh HD appears to be ok rebooted and still had the same problem. Did anybody experience such a thing? Any suggestions?