There is an issue with Leopard where if you do an update install it causes admin accounts to be changed into non admin accounts. http://docs.info.apple.com/article.html?artnum=306876 has a step by step solution . . .essentially you enable the root account temporarily, change your account back into an admin one then use Directory Utility to disable root again. Don't leave root permanently enabled. Personally I recommend against using an admin account for day to day usage as it leaves you more vulnerable in the event a virus/trojan/ whatever for Leopard was actually written. Create a second account and give it admin privs . . . then remove the admin rights from your normal, everyday account. When you need to do something that requires admin rights . . . even though you're logged in with your normal account just use the admin name/password in the authentication dialog and things will work perfectly . . . no need to log out/in with the admin account. This ensures that you will always get asked for things that require admin rights . . . and if the aforementioned trojan/virus/whatever appears and pops up the authentication dialog . . .and you know you're not doing anything you can intercept it. On Dec 23, 2007, at 23:32, Robert wrote: > I looked in /Users and tried that name. Didn't work. What has > happened is the other day the computer would not boot. I ended up > having to reinstall 10.5. I can't remember if I have installed > anything since I did this. Tonight I did the new security update. > When it came to installing you get a window showing your admin name > and asking for the password. Tonight the admin name was blank. I > tried using the user name in the home folder and my normal password > and if failed. This password has always worked up till now. I then > went to system prefs/account and tried that name. It failed.