124 - How to Turn On the Computer

The power button is a round or square button that powers an electronic device on and off. The button on a computer that is pushed in and released to turn the computer on. It should not normally be used to turn the computer off. Nearly all electronic devices have power buttons or power switches.

Power Buttons on Computers

Power buttons are found on all kinds of computers, like desktops, tablets, netbooks, laptops, and more. On mobile devices, these are usually on the side or top of the device or sometimes next to the keyboard, if there is one.

In a typical desktop computer setup, power buttons and switches appear on the front and sometimes back of the monitor and on the front and back of the case.

The power switch on the back of the case is actually the power switch for the power supply installed in the computer.

On/Off Power Button Symbols (I & O)

Power buttons and switches are usually labeled with "I" and "O" symbols.

The "I" represents power on and the "O" represents power off. This designation will sometimes be seen as I/O or as the "I" and "O" characters on top of each other as a single character, as in the photo on this page.

The power button on a computer (and many other devices) displays shapes which come from a standard of the International Electrotechnical Commission (IEC):

Turning On a Computer

A personal computer has a power button on the front. By pushing in on the button and then releasing it, you turn the computer on. You should hear a noise like a fan or a vacuum cleaner, and some lights will appear on the front of the computer.

Computer not responding

If you pressed the power button but the computer does not turn on, your computer may have a problem.

• Check if the computer power cable is correctly connected into power outlet.
• For laptop maybe the battery is fully drain. try to recharge the battery for a hour.

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