Power supplies feed your computer with a balanced amount of power, regulating a home's electrical output.
When your computer doesn't turn on, you could have a problem with your power supply that needs immediate attention. The power supply serves as a sort of electrical regulator for your computer in that it provides an adequate amount of power to each component in your computer, including peripheral drives and your motherboard. You must test your power supply before anything else when your computer doesn't turn on correctly, since it draws power directly from your house and, thus, becomes the front line ahead of your other hardware.
Instructions
1. Disconnect the power supply from any source of electricity.
2. Check the voltage regulator just under the power socket. Make sure that you set the voltage to the correct amount for the country you live in. For USA, you must set your regulator to 115 volts by switching it over to the side, if you didn't already set it that way.
3. Connect the power supply to an outlet to see if the fan spins when you turn on the unit. If connected to a computer, you might need to turn the computer on also. If the fan doesn't spin, either your power supply's fan or the power cable needs replacement. Try another power cable to see which one of the two problems you encounter.
4. Try another outlet to see if it's the outlet causing the issue.
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