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No Power In Desktop Computer Repaired

By on February 24, 2015
computer power switch repair2











I have got a call from one of my customers regarding his “computer not working”.  I have visited his place for troubleshoot the problem. On reaching his place I have turned “ON” the mains switch on visualizing inspection I found that the Monitor’s power light was ok that means power line was also ok.  Now by pressing ON / Off switch of computer there was no sign of life. I began to troubleshoot by checking on the AC mains voltages to the Computer. I found 230V AC which means good. For your information, in India we are using 230 vac.

Since the computer was having problem, I decided to open it up and checked the connectors/wires for loose connection.-all seems to be good. The next check was the power On/Off switch.

The fastest way to check the Power switch in desktop computer is to remove the reset switch connector from motherboard and place it to the power connector. You can do  this because both switches have the same function- these are momentary switches.

computer power switch

After connecting the reset switch in place of power switch and powered On, the computer came back to life! This means the power momentary switch have problem.

 computer power switch repair


I removed and replaced the power switch and see the result below:

computer power switch repair1This article was prepared for you by Yogesh Panchal who works as a Computer Hardware Engineer in Mumbai India.

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  1. S Ramachandran

    February 24, 2015 at 11:00 pm

    Thanks , yogesh ..good information , keep sharing your nice repair tipps.

  2. Robert Calk

    February 24, 2015 at 11:23 pm

    Good job Yogesh. Thanks for the article.

  3. Frank Rose

    February 25, 2015 at 12:50 am

    I have a Mo/Bo with blown caps and I am unable to melt the soldered ends on the defective caps what kind of heat do I need? I have tried different wattage soldering irons with no success, can you help me?

    Thank You

    • yogesh Panchal

      February 25, 2015 at 2:27 pm

      Frank ,
      I think 25W soldering iron enough.
      Do apply FLUX (Soldering/De-soldering Paste)on solder for component you are trying to remove and apply fresh solder first on the same then try.
      take care not to apply constant heat on motherboard or it will damage trace.

      • Humberto

        February 25, 2015 at 8:31 pm

        Yes yogesh Panchal , that's the way to do it.

    • Robert Calk

      February 25, 2015 at 6:46 pm

      Hi Frank,
      Of course, Yogesh is correct. But I advise everybody to get a Hakko 808 or a cheaper model to use for de-soldering if at all possible. They save you so much time and trouble and help keep you from damaging components and PCB's. I can't imagine not having one! They are not very expensive and you will be so happy that you bought one! If you don't trust anything else that I have ever said, trust me on this.

  4. Greg

    February 25, 2015 at 5:45 am

    are all appliances 230 volts there. Do use a separate ground. I know many countries do this. Here we split the 230 into 2 110 wite independent grounds. Do use 230 and ground.

    • Ehsan Murad

      February 25, 2015 at 12:02 pm

      Yes Greg,
      Here in Bahrain also we use 220-240V AC with separate ground

  5. Merlin Marquardt

    February 25, 2015 at 5:46 am

    Great tip!

  6. G

    February 25, 2015 at 11:55 am

    Thank you for your article and make it easy for repairing. Thank your Yogesh.

  7. Tito

    February 26, 2015 at 7:57 pm

    Good job Yogesh keep it up.

  8. jimmy

    March 5, 2015 at 7:49 pm

    hi Yogesh,

    i have this 775 motherboard that could not switch on. if i press the switch on button on the casing the only thing happening is the CPU fan roll once and stop. pls help me on this.

  9. nuhu Adam

    March 12, 2015 at 6:13 pm

    Hi yogesh thats a good one


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