My brother has a 10.2.8 machine that he can't log in too. When he tries it does the progress bar, but it just keeps going, and going. I did a permission repair from the install disk, no change. I can log in via airport (file sharing) but I can't get in locally. Should I just do a archive install? Do i have any other options?
Try starting in Safe Mode by pressing SHIFT as you start up.
If that doesn't get anywhere, try resetting the accounts password using the OSX install disks. It's a slightly different method for each install disk but it's pretty self explanatory how to do it. It's in one of the menus.