Yes you should replace the power supply and you can do it yourself go to the back of the tower and at the top you will be able to see the power supply it is held in with 3 to 4 screws open the side panel and unplug all the wires that go from the power supply to the different components of the computer
then unscrew the power supply from the back of the tower and lift it out you will need to get a ATX
P4 power supply you can get the best price at new Egg ,or Amazon .com the prices very in price from 30.00 to a Hundred or more
Test your PSU or replace it if your power supply units fan is not working your PSU is faulty
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