Power supplies are not something you want to cheap out on, or hang onto if they're on their way out. They're often the noisiest component of a desktop system, they're fickle, and they can bring down other components if they fritz out. Lifehacker alumnus Rick Broida ran down the basics of unplugging and removing your power supply and re-seating a new one in its place. That answers one half of the equation, but how do you know what PSU to replace it with? Online parts megastore NewEgg offers a convenient Power Supply Calculator that figures out power supply needs from the components already installed. Just as with a house, you can sometimes get by with less than you should, but you don't want to find out what happens when you're wrong.
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