Updated to 10.4.10 today on intel iMac. When go to login, it will login then load the wallpaper (some of the icons on a rare instance) then it will log back out to the login page. I tried booting into single user mode and getting in through that way and had no success. I tried to boot into safe mode and it kicks me out even quicker. I do not have an intel based imac hardware discs to run a hardware test to repair permissions (which I think would fix it). Has anyone had this problem? Any suggestions to fix it?