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Relative easy. Open up the case and be careful to see what wires are connect. Replace each one carefully. There is the big wire that containes a bundle. This goes to the motherboard. There is only one way to install it. There is a 4 prong molex wire that goes to the hard drive. There are extra wires just in case you need to add another hard drive for example. There shoudl be 4 screws holding the power supply in place. Remove them from the back of the PC
Open your computer case and plug the computer in. Look for any LEDs on the motherboard. A power surge can damage any and all components in the system. The only easy way to test the power supply is check it in a working computer. But if you get another power supply you can hook it to your system to see if the problem goes away. Power supplies can be found used for less than $20, look in your area for a place that sells used computers.