Asus desktop won't boot after PCU disconnected

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  1. Posts : 52
    Windows 10 64 bit
       #1

    Asus desktop won't boot after PCU disconnected


    Hey all I have a Asus computer that every time I disconnect power to the motherboard (ex. unplugging) it won't display anything the power button light up the fans will spin but no display until I shut it down take out the ram drives (2x 4gb ballistics sport) then it will boot up runs like a charm, but the next power outage...

    Anyone who can offer any advice would help alot.

    Will update the specs soon
      My Computers

  2. bobkn's Avatar
    Posts : 3,602
    Win 10 X64 Pro 20H2 19042.685
       #2

    Semi-wild guess: replace the CMOS backup battery. (Usually a CR2032 button cell.)
      My Computers


  3. Posts : 714
    win10 home
       #3

    Try reinstalling the ram sticks,one at a time to see if one or both are the cause.
    Could you confirm you actually disconnect the PSU supply to the mobo?
    The PSU has three rails,3.3v,5v.12v,which supply different components,disconnecting any one will give you weird results.
      My Computer


  4. Posts : 52
    Windows 10 64 bit
    Thread Starter
       #4

    joeandmarg0 said:
    Try reinstalling the ram sticks,one at a time to see if one or both are the cause.
    Could you confirm you actually disconnect the PSU supply to the mobo?
    The PSU has three rails,3.3v,5v.12v,which supply different components,disconnecting any one will give you weird results.
    Back up here by disconnect the PCU I meant that I unplugged it from the wall and then it would not boot

    - - - Updated - - -

    bobkn said:
    Semi-wild guess: replace the CMOS backup battery. (Usually a CR2032 button cell.)
    don't think that's the problem but will try shutting down and draining the battery without disconnecting the power
      My Computers

  5. spunk's Avatar
    Posts : 2,834
    Windows 10 Pro 64 Bit 20H2
       #5

    The CMOS battery is the coin size battery on the motherboard. It would take years for you to drain the CMOS battery of your desktop. the suggestion was to replace this coin size CMOS battery.
    There should also be a Jumper pin close to the battery. After unplugging the power from the back of the desktop, remove the jumper pin, remember how it was placed and where. Now hold the power button on the case for a few seconds to release any saved power. now put the jumper pin back on. this will clear the CMOS. Attach the power cable and turn it on. You will need to boot into Setup (Bios) to reset the date and time and any other settings you set.
      My Computer


  6. Posts : 52
    Windows 10 64 bit
    Thread Starter
       #6

    spunk said:
    The CMOS battery is the coin size battery on the motherboard. It would take years for you to drain the CMOS battery of your desktop. the suggestion was to replace this coin size CMOS battery.
    There should also be a Jumper pin close to the battery. After unplugging the power from the back of the desktop, remove the jumper pin, remember how it was placed and where. Now hold the power button on the case for a few seconds to release any saved power. now put the jumper pin back on. this will clear the CMOS. Attach the power cable and turn it on. You will need to boot into Setup (Bios) to reset the date and time and any other settings you set.
    I've been told that if you short the two (2) terminals of the CMOS battery that that would drain it
      My Computers

  7. bobkn's Avatar
    Posts : 3,602
    Win 10 X64 Pro 20H2 19042.685
       #7

    GoldenDog said:
    Back up here by disconnect the PCU I meant that I unplugged it from the wall and then it would not boot

    - - - Updated - - -

    don't think that's the problem but will try shutting down and draining the battery without disconnecting the power
    I wasn't thinking of clearing the CMOS. (AKA resetting the Real Time Clock, etc.)

    My idea was that the battery is dead. That would cause the CMOS settings to be affected when power is removed.

    Long shot, really. How old is the PC? CMOS batteries tend to be good for years.
      My Computers

  8. NavyLCDR's Avatar
    Posts : 15,505
    Windows 10 Pro
       #8

    GoldenDog said:
    I've been told that if you short the two (2) terminals of the CMOS battery that that would drain it
    If you short the two terminals of any battery it will drain it, and with some start fires and cause explosions. Never short together the terminals of any battery, no matter how small.
      My Computer


  9. Posts : 1,243
    Windows 10 Home 2004 19041.804
       #9

    GoldenDog said:
    I've been told that if you short the two (2) terminals of the CMOS battery that that would drain it
    Don't believe all you hear and do not ever short the terminals on a Lithium battery.

    Google is your friend and I would strongly suggest search Lithium battery terminals short or something similar.
      My Computer

  10. bobkn's Avatar
    Posts : 3,602
    Win 10 X64 Pro 20H2 19042.685
       #10

    I wouldn't expect a CMOS backup battery to explode by shorting it. It matters little, as there is no point to doing it.

    If you want to reset the CMOS, turn off the power (or unplug it). Press the power button to discharge the PSU. The use the jumper to clear the CMOS. (Or the button, if your motherboard has one.)
      My Computers


 
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