[ubuntu] Why is it?

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http://ubuntuforums.org – I am really happy running Ubuntu 13.04 but unfortunately i am unable to shut down my laptop at night? When i go to the gear wheel icon in the top right-hand corner and select shut down it does exactly that but within a few seconds starts to reboot? I was fortunate in that i had Puppy Linux Slacko installed on a USB stick and now in order to shut down my laptop at night i must reboot the machine into Puppy Linux Slacko just to shut down. I know very little about computers or operating systems but there must (in my opinion) be something wrong with Ubuntu 13.04 for this to happen? Despite the p (Hardware)