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  • #4008909

    After shutdown, computer takes many attempts to start again

    by nbhamilt ·

    Desktop has run like a dream for quite a few years then all of a sudden, after being shut down, on restart, it goes into an endless loop of on off, on off, restarting continually after about 0.5 of a second. I turn power off, and back on, try again, same thing, unplug, reset, nothing seems to fix it until it randomly starts on the 20th or 30th attempt.

    I think it must be motherboard, but could be power, or memory or even MPU, anyone else experienced this? Any good fixes? ( i read one person say memory is failing, another the power supply capacitors, but its so consistent, it does not feel like those.)

    ASUS maximus hero VII,
    VengPro DDR3 8GB 2133
    850W EVGA GOLD-2 PSU
    Intel Core i7 4790K s1150
    4GB MSI GTX970 GAMING PCI-E

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    • #4008913
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      Reply To: After shutdown, computer takes many attempts to start again

      by birdmantd ·

      In reply to After shutdown, computer takes many attempts to start again

      Sounds to me that the power supply is failing. If so, that is relatively inexpensive to get fixed/replaced in the grand scheme of things.

      It could be a failing power switch or any other onboard connector.

      It is hard to diagnose from the other side of a keyboard, so I can only speculate.

      • #4008914

        Reply To: After shutdown, computer takes many attempts to start again

        by nbhamilt ·

        In reply to Reply To: After shutdown, computer takes many attempts to start again

        need to find someone happy to lend me a modular power supply and test it. i tried taking each stick of memory out in turn and that made no difference

        interestingly, i can ‘reset’ the pc and it restarts fine, it just cant cope with being put to sleep or fully shut down .

        • #4008918
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          One more thought….

          by birdmantd ·

          In reply to Reply To: After shutdown, computer takes many attempts to start again

          Are you certain the PC isn’t overheating? On the first PC that I built, I bought a case a little too small to allow adequate cooling and ultimately wound up buying a larger case with multiple case fans using the same PC components and it resolved the same type of power on/off issue once updated.

        • #4008922

          Reply To: After shutdown, computer takes many attempts to start again

          by nbhamilt ·

          In reply to One more thought….

          I wouldn’t have thought so, as its on startup and after 0.5s i cannot imagine it getting too hot that quickly to go into such a loop, when I had a pc overheat it would shut down for an age, not just keep restarting, plus I have a watercooling rig on the MPU and it runs fine once it does manage to start. in fact i leave it on 24/7 so that i don’t have o go through the rigmarole of 30 attempts each morning…

    • #4008920
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      Small world.

      by rproffitt ·

      In reply to After shutdown, computer takes many attempts to start again

      My son’s older PC had that and other issues. We tracked it to his (get this) GTX 970. I had a 1060 from the office, popped it in and the machine was fixed.

      Now this may not be your issue but what’s next is the motherboard and power supply.

      The CPU has onboard graphics so the next time this happens, remove the 970 and test with onboard graphics.

      -> And to be clear, when we work on the PC, we unplug it from the wall.

      • #4008923

        Reply To: After shutdown, computer takes many attempts to start again

        by nbhamilt ·

        In reply to Small world.

        thanks, i will try that again and fully remove the card, but I’m pretty sure i tried to boot it without the power in the graphics card and it did the same. I did just notice that the fans on my GTX 970 are not turning, but that might just be because its not doing any work right now.

        personally, i leave it all plugged in so the case is earthed, just turn the power off…

        • This reply was modified 2 weeks, 1 day ago by nbhamilt.
        • #4008925
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          Some PCs, in fact many.

          by rproffitt ·

          In reply to Reply To: After shutdown, computer takes many attempts to start again

          Keep power on to at least the +5VSB and sometimes more. Folk get real cranky if they burn out something just because they worked on it while it was “off.”

          If it does the same without the 970, the usual parts are PSU and motherboard. And no, you can’t tell except to swap these out.

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