Originally Posted by chenderson
When i try to reboot as a user other than root, it asks for my password.
That is not the default behavior. Reminds me of poorly set up keyring programs.
How are you attempting to reboot/shutdown? You should
be able to click on the Xfce menu, choose log out, and reboot/shutdown from there - As a regular user - without being prompted for a password.
Are you starting Xfce with startx from run level 3, KDM, or some other display manager.
Have you installed other 3rd party software? Some software - especially improperly configured precompiled software from certain places - have been known to cause issues
If you did not do a full install, you might have forgotten an essential package.
After adding/removing/changing users and groups, be sure to log out for the changes to take effect. Here's the list of groups my regular user is a member of.
grep keith /etc/group
If all else fails, in a terminal, su to root and type either poweroff, or reboot.