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Computer sometimes won't turn on when i press the power button

I have a problem where my computer sometimes won't power on, usually it will 80% of the time, but 20% of the time pressing the power button doesn't do anything. When the computer refuses to power on i have to press the restart button for it to turn on. I have the power switch properly connected to the motherboard on the correct pins. Could it be the power supply or the motherboard?

More things i know about my computer:

  • The cpu has enough thermal grease, and the heatsink and fan are perfect (4200 rpm.).
  • The cpu is an Athlon XP 2700+ and its average temperature is 50 to 60 C on normal use, internet browsing word processing etc. sounds okay to me
  • I have cleaned the computer of all dust.
  • The power supply is an ANTEC brand pwr supply that came with the ANTEC chassis not sure about the model of the chassis. i have had many problems with these power supplies
I suspect that this is caused by the following in order of likeliness
  • a faulty power switch,
  • bad power supply,
  • maybe the cpu is overheating,
  • bad memory,
  • faulty motherboard

Thanks for your help in advance.

Posted by on

  • 2 more comments 
  • stejeda777
    stejeda777 Feb 27, 2008

    oh hey thanks for the quick reply, to answer your question the computer is plugged in directly to a power brick that goes to a wall jack. no ups here

  • stejeda777
    stejeda777 Feb 28, 2008

    thanks when ill see if i can buy a new power supply im completely broke at the moment (im a pooor student with no job) but i think your right so ill give ya the rating since im not sure when ill be able to afford one. Thanks!

  • stejeda777
    stejeda777 Feb 28, 2008

    By the way ill follow up and let you know how it goes once i find a good power supply.

  • Anonymous Apr 10, 2009

    was connected but no luck, can someone help me? My HP Desktop PC was froze so I turned it off and now when I push the on button, it doesn't turn back on, i checked that everything was connected but no luck, can someone help me?

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  • Master
  • 3,587 Answers

You are correct on one and two above, in your suspicions..how's your power from wall, and do you use a UPS?

check your computer warranty here 4 FREE

Posted on Feb 27, 2008

  • Patrick Michaels
    Patrick Michaels Feb 27, 2008

    the relationship between the power supply and the motherboard is vital. If you are experiencing soft failures of no turn on, that's a clear symptom that somethings soft inside that power supply. They are only around 30 bucks, so I recommend you consider getting a new one.

    if you data is important, consider an APC ups.


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