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How to Replace a PC Power Supply

When a PC power supply is bad or is starting to go bad, two things usually happen. You hit the start button and the computer does not turn on, or you hear a strange noise but the computer won't boot. The job of the power supply unit is to convert the electrical current. Many power supply units have a switch, on the back of the tower, calibrated 115V OR 230V. A power supply unit is usually of the shape of a square metal box.

Things Needed:
  • Set of Screwdrivers
  • Anti-Static Mat or Anti-Static Band (optional but recommended)
Precautions:

You will have to ground yourself whenever you open a computer. Failure to do this might damage your CPU or chipset. Electrostatic energy could lead to frustrating lockups, blue screens, and memory problems. An antistatic wristwatch or an antistatic mat can help you avoid damaging your computer. You can also avoid static charges by avoiding carpet and by touching the side of the computer case constantly to keep yourself grounded.

Also, while working with an open computer, make sure the computer is turned off and unplugged for your safety.

Step 1 - Confirm that the power supply unit is faulty

If the computer will not boot or turn on at all, the power supply is a likely culprit. If you do not have the tools to test a power supply, you will just have to get a new one and see if the new PSU fixes the problem.

Step 2 - To replace the power supply unit, you will need to open the computer.

Step 3 - Disconnect the tower or machine from an external power supply. If you would like, you can disconnect the keyboard, mouse, speakers, and cameras.

Step 4 - Open up the casing with the correct screwdriver. Deposit the screws in a safe place.

Step 5 - With the screwdriver, unscrew the PSU mounting screws from the outside. Carefully remove the power supply unit. The PSU is where the external plug comes into the computer case and you should see some screws on the outside of the case holding the power supply in place.

Step 7 - Check to see that the new power supply unit can fit properly in your machine.

Step 8 - Screw the new power supply unit back into position. Reconnect the internal connections. Fasten the case cover.

Step 9 - Reconnect all external connections and boot up your computer.

If you are still having trouble, make sure that everything is plugged in, that the 115V OR 230V is set correctly, and that the power supply unit is turned on. Most of the time, the PSU itself will have a switch that you will need to flip into an "ON" position.





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