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Solved PC won't boot anymore

Discussion in 'Hardware' started by balazs787, Sep 26, 2017.

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  1. balazs787

    balazs787 Thread Starter

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    I cannot turn on my PC. When I turn on the power supply it does a repeating, fast, high pitched, but quiet beeping sound (similar to some bird chirping). The power button on my PC doesn't respond at all, even the fans won't start. I tried disconnecting pretty much everything from my motherboard and adding more and more things slowly to no avail. I also tried out a new PSU but the same thing happens. If I disconnect the 24 pin cable, only then do I get a different sound (a continous high pitched sound). Before this I accidently plugged in the old PSU's FDD cable into one of the F_USB slots. Could I have killed my mobo with that? If not what could be the problem? How can I sort out if it's a bad mobo or something else?
     
  2. Macboatmaster

    Macboatmaster Trusted Advisor Spam Fighter

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    This is the standard design FDD power cable
    https://www.lifewire.com/floppy-drive-4-pin-power-connector-pinout-2624581

    Normally as far as I know the front port usb header on the MB - (I do appreciate you say
    looks like these examples
    http://www.hardwaresecrets.com/installing-frontal-usb-ports/

    In simple terms the power to the front port comes out of the motherboard
    YOU have put power in to the board

    If that is what you have done - the board is a lost cause.
    ONLY a professional with professional testing equipment could even start to find the damage.
    The cost would be prohibitive

    I take it that front port is NOT now connected
    That said it will not I am 99.9% certain make any difference
     
  3. balazs787

    balazs787 Thread Starter

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    I see and thank you for your answer! So then it rules out anything else being broken. I will probably buy a new mobo tomorrow, it was pretty old anyways.
     
  4. Macboatmaster

    Macboatmaster Trusted Advisor Spam Fighter

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    On the evidence available to us YES
    Not too long ago on this site I dealt with a topic where someone had connected a power in from the PSU to a fan OUT connector on a brand new top of the range MB. It was returned and tested - GONE to motherboard heaven

    So it can happen
    The only possible test is to disconnect front headers for power button etc

    • Ensure the 24-pin and 4/8-pin power headers are connected to the motherboard.
    • Ensure all other necessary power headers are connected to corresponding devices.
    • Locate the power switch header for the front panel connectors on the board. These are normally labeled “PWR_SW,” “PWR_BTN,” etc. In this instance, no cable is connected to the positive and negative headers.
    • Ensure the PSU is switched on and plugged in.
    • Find a screwdriver. Bridge the two pins allocated to the power button. This will eliminate any chance of damage to the front panel - I do not expect it to work
    • The system should turn on.
    BE VERY CAREFUL - ensure all parts possible are taken out - disconnected so there is no chance of damaging those

    OR if that fails the only other possibility is to try shorting on the 24 pin connector
    https://arstechnica.com/civis/viewtopic.php?t=1107805

    This is usually used to check if PSU turns on with it disconnected from MB
    DO BE CAREFUL PLEASE = otherwise it may be goodbye PSU as well
    BUT in your case will further eliminate chance of it only being front header and if that test fails I would say
    YES the board
     
  5. balazs787

    balazs787 Thread Starter

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    So yeah, just bought a used mobo, was pretty sure I killed the old one. Now it all works fine. Note to self: don't try to fit cables into slots which they don't belong to.
     
  6. Macboatmaster

    Macboatmaster Trusted Advisor Spam Fighter

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    So I presume my suggested tests failed
     
  7. Macboatmaster

    Macboatmaster Trusted Advisor Spam Fighter

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    Yes but perhaps you have not noticed the post
    In error balazs787 connected the FDD power connector to the front usb port header on the motherboard
    In otherwords - power in - for a header that is power out to usb port
    That said welcome to Tech Support Guy
     
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