Since downloading Lion on my Mac Pro I can not shut down, restart, or log out on my computer;

I tried both the Apple menu and the keyboard shortcuts and nothing happens when i do both of them. I can not do a software update now because of this

Bat signal? What's that?
Mike, try resetting the Power Management Unit (PMU). Read the linked article, then scroll down to find the instructions for resetting the PMU on your model, then do this:
1. If the computer is on, turn it off.
2. Reset the power manager by simultaneously pressing and then releasing Shift-Control-Option-Power on the keyboard. Do not press the fn (Function) key while using this combination of keystrokes.
3. Wait 5 seconds.
4. Press the Power button to restart the computer.
http://docs.info.apple.com/article.html?artnum=14449

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