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Replacing a Power supply in a PC

Updated on September 21, 2011

Power supply

A power supply changes the alternating current (AC) that comes from an electrical outlet to the direct current (DC) that a computer can use.

Replacing a Power supply

Before replacing a power supply, turn off the computer and unplug the power cable. Remove he cover from the computer case.

1) Disconnect the power supply cables from the system board and other devices inside the computer.

2) Remove screws that secure the power supply in the computer case. Then slide the power supply out of the computer case.

3) Slide the new power supply into the computer case and use screws to secure it.

4) Reconnect all the cables. If necessary, reconnect the power switch and replace the front of the computer case. Then replace the cover on the computer case.


How do I know when I need to replace my power supply?

Power supplies are very reliable and usually work for many years without any problems. As a result of a faulty power supply, the computer may lock up repeatedly or other components may fail to work consistently.

Before you replace a power supply, make sure the problems you are experiencing are not caused by another component some problems that you think are due to faulty power supply may actually be caused by another component, such as a malfunctioning hard drive.

What safety precautions should I take replacing a power supply?

you should unplug the power supply from the electrical outlet on your wall and you should never take the cover off a power supply your replacing . Even without the power supply being plugged into an electrical outlet, it can still cotntain power.


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