[SOLVED] installed updates, now won't shut down

view story

http://ubuntuforums.org – I recently installed ubuntu 12.04 on my laptop, when I down loaded the updates a few days later I find it no longer does a complete shutdown, The screen comes up with the prompt for password, the settings icon shows a shutdown symbol , but it is obviously not. I can force shutdown by holding the power button. I need total shutdown as I have dual boot and thats the only way to bring up the menu to choose between OS. The shutdown worked until I installed the updates. Any suggestions. Thank you for looking. (Hardware)