Sleep, Shutdown, Restart, Lock Screen, Volume Control

After booting, after an undetermined amount of time, I am not able to shutdown the computer, reboot the computer, sleep the computer from the apple menu, or the power button. I am able to sleep the computer by closing the lid. I am not able to control volume from the keyboard keys, but can from the menu bar. I am not able to lock the computer via the menu bar (lock icon->lock screen). I am able to lock the screen using "/System/Library/CoreServices/Menu Extras/User.menu/Contents/Resources/CGSession" -suspend command, however, this seems to lock the screen in a different way that clicking the lock screen button from the menu bar. The computer acts like I just never chose the menu items, or pressed the buttons. Before upgrading I did not have these problems. After the computer has a hard shutdown performed, the functions seem to work for a while, but then randomly stop responding.
Any advice?
Thank you.

It sounds like you have a mess Andy. You could reinstall Sno with an erase and install. Or you could go back to Leo via an erase and install or an archive and install. The erase and install alternatives assume that you have a good backup or that you don't mind reinstalling your apps. You'd have to back up your data, of course. I would repair disk before erasing and installing.
Archive and install is a good play assuming that you are not ready to do an erase and install and that you want to go back to Leopard. Note that Apple doesn't recommend going backwards this far (i.e., going back beyond a current major version, say, going 10.6.1 back to 10.5.7) via Archive and Install. But, regardless it is a way to get back to Leo and to pave the way for an erase and install of Leo in the future. Note that if you go backwards, then you will not be able to preserve user and network settings--which is a good thing. Fortunately, there is a way to extract anything needed from a prior user home folder. [Here is the explanation|http://support.apple.com/kb/HT2196]. Even though you don't want Sno any more, it would be nice to have a bootable clone of your Sno installation on an external for safety purposes. Also, I would repair disk and permissions before archiving and installing.

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Sleep, Shutdown, Restart, Lock Screen, Volume Control

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