I am looking into some computer issues a friend was having with her G5 iMac. While I was snooping around some simple things that could be the issue she was having I came across an interesting issue. When in System Preferences clicking the "Click the lock to make changes." does absolutely nothing. It is kind of silly as I am unable to do anything in System Preferences, which severely limits what I can do with the computer. I searched Google about 25 different ways and came up with nothing on how to correct this problem. Any help would be greatly appreciated.