Today’s PCs are designed to be turned on with the power button that sits on the case, but turned off via the Windows shut down menu option. If your computer freezes, and you can’t get to the software shut down, do not unplug the computer. Rather you should hold the power button down for at least five seconds. To learn more about PC power supplies, read How Stuff Works.
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Feldman, Barbara. "PC Power Button." Surfnetkids. Feldman Publishing. 5 Feb. 2003. Web. 17 Jul. 2014. <http://www.surfnetkids.com/tech/206/pc-power-button-24/ >.