Bad power supply or other?

Discussion in 'PC Hardware' started by boscru6469, Aug 22, 2019.

  1. boscru6469

    boscru6469 MDL Senior Member

    Jan 9, 2012
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    I have an HP m940 f desktop. About a year or so I lost my on board audio. I installed a USB audio dongle and that worked fine. The past couple of months when I press the power button nothing happens, the power button doesn't even light up. I remove the power cable and hold the power button for about 10 seconds. I plug the power back in, press the power button, the power button lights up and the PC starts up. Is this a bad PSU or Mobo?
     
  2. kaljukass

    kaljukass MDL Expert

    Nov 26, 2012
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    Probably nothing like what you offered.
    Typically, such things are caused by one of the following:
    1. computer did not shut down properly at last time;
    2. the computer has some settings that have changed for some reason, such as the CMOS/BIOS battery is out of date or the connection is poor (the battery voltage should not be lower than 3.2V when running, check it), to restore default settings remove battary out for about minute, then put it back and check voltage. If it is less than 3.2 V, Your computer may do weird things, also will not remember settings, some functions may not start etc. But basically computer must start and work.
    3. may be there was some random problem
     
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  3. Enthousiast

    Enthousiast MDL Tester

    Oct 30, 2009
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    Check for bad/bulging caps on the mainboard.

    And if you have a spare psu, test that one.
     
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  4. Joe C

    Joe C MDL Guru

    Jan 12, 2012
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  5. boscru6469

    boscru6469 MDL Senior Member

    Jan 9, 2012
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  6. boscru6469

    boscru6469 MDL Senior Member

    Jan 9, 2012
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    Thanks for all the advice. I will be away for a week and then I will try a new cmos battery and look for the bad caps. If everything looks okay then and I am still having the problem I will try a PSU I have. If the PSU solves the problem I will buy a new one.
     
  7. Joe C

    Joe C MDL Guru

    Jan 12, 2012
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    #7 Joe C, Aug 24, 2019
    Last edited: Aug 24, 2019
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  8. zen45

    zen45 MDL Addicted

    Feb 25, 2010
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    I would open the box and wiggle all the power connections one time in fact I would wiggle all the connections , some time as things age vibration from fans or other parts cause a not so good connection , I would do that before spending any time or money trouble shooting !
     
  9. Michaela Joy

    Michaela Joy MDL Crazy Lady

    Jul 26, 2012
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    It's been said by others here, so, I'll just reinforce what others have said.

    I would recommend changing the CMOS battery no matter what. Then, start looking at the MoBo and the PSU.
     
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  10. MS_User

    MS_User MDL Guru

    Nov 30, 2014
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    fastest way is swap out the PSU if u have another...but it could also be a bad mobo....u can find one on ebay real cheap for under $25.00.
     
  11. MS_User

    MS_User MDL Guru

    Nov 30, 2014
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    i would also try that first and see what happens.