Just a shot in the dark here, but you are going start >shut down right? Instead of hitting the power button. If you are hitting the power button and it does this that can be changed by right clicking the desktop, properties, screen saver, power, advanced, then selecting shut down from the drop down menu for power button. Otherwise you probably have a board wiring issue like mentioned above.
Change the world. Of one person. Today.
If your equation requires either a complex combination of variables to get the desired result OR you can't seem to get the result regardless of the variables....it ain't your variables, it's your constant.