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PC cannot power on

Discussion in 'Troubleshooting and Repair' started by senderj, Dec 8, 2018.

  1. senderj

    senderj

    10
    1
    Mar 8, 2010
    I have a 4 years old Asus B75M-A motherboard that failed to power on. Pressing the front panel power switch or shorting the on-board power on pins, the cpu fan turns briefly then stops. Below are what I've tested so far:
    - Test the psu alone with green short to ground, all voltages ok
    - Measure the 5VSB on board, ok
    - Use the psu on a known-to-work motherboard (another Asus) showed that the psu works
    - Use this problematic motherboard with a known-to-work psu, same problem
    - Check the capacitors (all are aluminum cased) on the board, all looks fine
    There were other intermittent problems before it reaches this total failure:
    - usb HDD couldn't be started, even usb thumb drive couldn't be detected
    - reboot itself without a reason
    I wonder if cpu or the board is the cause and how it can be repaired. Please help.
     
  2. Bluejets

    Bluejets

    3,360
    670
    Oct 5, 2014
    Have you removed all drives and aux plug in boards and
    just tried to boot with the motherboard on it's own?
     
  3. senderj

    senderj

    10
    1
    Mar 8, 2010
    Bluejets, thanks for the reply. Yes, all unplugged except cpu and its fans.
     
  4. davenn

    davenn Moderator

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    Sep 5, 2009

    Have you checked/replaced the memory sticks ?
     
  5. senderj

    senderj

    10
    1
    Mar 8, 2010
    No but problem exist with or without RAM.
     
    davenn likes this.
  6. Bluejets

    Bluejets

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    670
    Oct 5, 2014
    Sounds like time for a new motherboard board then.
     
    davenn likes this.
  7. davenn

    davenn Moderator

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    1,711
    Sep 5, 2009


    ditto Bluejets comment ... there isn't really anything a DIY'er can do with MB repair ... even the Pro computer dudes don't bother repairing
     
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