awful week

Can anybody help? This week, my server (tiger, afp, 200 home folders) decided to treat me to a horrible week. All sharepoints could not be found in WGM. My startup backup disc was behaving in an identical way. All logins failed- "because of an error" I had to delete and re-make all 200 user accounts I had to re-do the permissions of every home folder, and propagate. Any reason why this sort of thing would happen?