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OK. I'll take a crack at it. The login screen you get when you first boot up is generated by a program called a display manager(dm). There are two dms incommon use in linux, kdm which is kde based and gdm which is gnome based. Most commercial distros modify one of these two dms to include their logo and additional features unique to that distro. I think what you probably want to try to do is uninstall the dm and reinstall it and thereby hopefully get that missing shutdown button back.
I'm not that familiar with suse but I did recently do an ftp install of suse 8.2. The info I'm about to give you is based on 8.2 but it should be similar in 8.1.However, I have never used 8.1 so proceed at your own risk.
First how to find an unistall the dm. From what I can tell, suse's dm is based on kdm. Go into the Yast Control Center>Software>Install and Remove Software. A popup window will appear and there should be a drop down menu button called Filter. The choices in the menu are Selections, Package Groups, Search, etc. Choose the Search function and in the search field below type "kdm" w/o quotes and hit the Search button. When I did it this is the result I got from the search:
kdebase-kdm The KDE login and display manager
There's a version number and other info which would be different in 8.1. Go to the search results and right click on the above entry and several options will be listed for the package. Before going through deleting and reinstalling the package, you might want to try the update option and see if that fixes things. After selecting "Update", hit the "Accept" button at the bottom and Yast will automatically update the package. Reboot and see if you've got your Shutdown button back. If not, do the "Delete" and then reinstall the package. Reboot again and see if the problem is fixed.
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