There's no way to repair your computer's power supply, all you can do is replace it, it's suggested that you recycle your old power supply by finding a local or mail order recycling company. Now to find the new power supply, it's recommended that you go to the manufacturer's website to order a new one.
To actually install the new power supply is going to turn off your PC, unplug it and remove the case. The computer is old power supply will be in the corner of the case, the backend will fit against the back of your PC where the fan can blow out the hot air, and on the other side will have a ton of colorful cables coming out of a small hole. A tip for making this process run smoothly is to take a few digital photos of where everything plugs into. Neither going to start by unplugging the power cables from the motherboard, there are two of them, then unplug the cables from hard drives and CD or DVD drives. Now you're going to unscrew the four screws that hold the power supply to the computer's case, but make sure you don't remove the screws holding the power supply's internal fan. Now you're going to pull out the power supply. Then you're going to look at your new power supply, if you live in the United States you're going to want to make sure that the red switch on the back of the power supply is pointed to 120 V, if you're country uses 220 V, you got a lot of flip the switch to that setting. Now you just have to do everything you just did in reverse.
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