Turning The Computer On

Let’s get started! As you sit down at your desk, you can assume that your computer system is one of the three states : 

OFF: This is exactly what it sounds like. The computer is off, and no parts are running or working. The monitor is black (no images), there is no “whirring” sound from the CPU, and the computer is unresponsive to the movements of the mouse or pressing keys on the keyboard. The power button would not be lit up.

 
ON: When a computer is on, you should see images on the monitor, you will most likely hear a “whirring” noise coming from the CPU (hopefully not too loud!), and the pointer on the screen (the small white arrow) should respond when you move the mouse.

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Turning The Computer On

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