The power button does not directly control power to the computer. Instead, when you slide the power button toward the front of the computer and then release it, the button momentarily closes the power switch on the system board. The power switch sends a signal to the power management controller, signaling the controller to initiate a change of state of the computer's power. The resulting power state depends on the present power state. The following subsection gives a description of the power states.
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Read how to maintain and repair any desktop and laptop computer. This Ebook has articles with photos and videos that show detailed step by step pc repair and maintenance procedures. There are many links to online videos that explain how you can build, maintain, speed up, clean, and repair your computer yourself. Put the money that you were going to pay the PC Tech in your own pocket.