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Video:Install a PC Power Supply

with Don Schechter

Is your computer's power supply on the fritz? Learn how to install a power supply in a desktop PC with these easy steps.See Transcript

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Transcript:Install a PC Power Supply

Hi, I'm Don Schechter for About.com Computing. Today I'll show you how to install a power supply in a desktop PC.

Power Supply Precautions

Before we begin, you should know that many brand name PCs use specially designed power supplies. So, make sure you contact them directly before installing a new power supply. Also, an unplugged power supply still can give you a powerful electric shock by put something inside an open vent.

Prep the Computer

First, turn off the computer and unplug the power cord. Next, open the computer. Some computers have a button or buttons that you press to open the box. Some have screws on the rear of the case which must be removed. I just need to remove the screws on the back of the case. Slide the casing back. Now you have access to the inside of your computer.

Remove the Old Power Supply

If you are replacing a power supply, you will first need to unplug all devices that are currently connected to it, and then unscrew it from the case. I'm going to take off the screws and carefully remove the old unit making sure not to hit other parts. Save your screws for the new power supply.

Install the New PC Power Supply

Now, align the new power supply with the cooling fan facing out the back of the case. Mount the unit with your screws. It is a good idea to hold the unit in place so it doesn't fall on other components.

Set the Power Supply Voltage

Once it is firmly in place, you must set the voltage switch. If you live in North America or Japan, set the switch to 110/115v. If you are in Europe, set the switch to 220/230v. Check to see what voltage your power supply is if you live outside of these areas.

Plug in the Computer's Components

It's time to plug in all of your computer components. Take the biggest plug and connect your motherboard. Attach the four pin connectors to hard drives and CD or DVD drives, and use the small four pin connector for your floppy drive if you have one.

Reassemble the Computer

Close up your computer and plug in all of your cables. Flip power switch to the on position on the power supply. And then boot up your computer with the power button which is normally on the front of the computer.

If something doesn't work properly, you most likely didn't connect the power cables tight enough.

Thanks for watching. To learn more, visit us on the Web at computing.about.com.
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