Question about Gigabyte GA-K8N Pro-SLI Motherboard

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When I push the power switch nothing happens....

Hi , I'm Koen , i'm from Belgium, and i have the following problem with powering up my computer:

When I push the powerswitch of my computer nothing happens. It always went well before as long as I did not unplug it from the mains. (220v) . So last week i had to unplug it because i was installing some extra memory cards.(upgrade up to 4 GB) So when the cards where installed I pluged in the mains again and hit the power switch, nothing happened . Then i started unplugging some usb connectors , and plug them back in again , and hitting the power switch again , no use , until suddenly when i unplugged and reconnected a usb again , it started !!.
When i shut it down , the normal way , and tried to power it up again ,again nothing happend like before, so i did the trick with the usb connector again and it started.
So i thought the powerunit was not working ok , it was a q-tec PSU 450 , after reading on forums there where lots a problems with q-tec psu's , I bought a new psu, a corsairHX620W modular. I installed it , reconnected everything , double cheked , and then i hit the power button : same result as before , nothing happens. If i do the the trick with the usb, pull it out and back in again a few times , the computer starts up and works normal !!! so ....this is really driving me crazy ...
My motherbord is a GA-K8N-Pro Sli from Gigabyte,a couple a harddisk , Western Digital , amd x64 dual processor, nothing out of the ordinary, no overclocking or tuning.
I'm out of idea's to try , and the only thing i don't want to hear is that my MB is bad.....
Has anyone got any idea what might cause this problem ?? I had this problem once before i installed the extra memorycards , but after it restarted, with the usb trick, i could always restart it afterwards with the power switch in a normal way ,as long as i didn't remove the mains.
Now , i always have to do the usb trick everytime even when i don't unplug the mains.... , i'm getting a little bit
I hope someone has heard of this before ,or has a clue what might cause this erratic behaviour ?

So many thanks in advance for having read my story, and maybe provide a slolution...

Thank you.

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  • 3 more comments 
  • kope436 Feb 28, 2009

    hi,thanks for the respons, i already unplugged everything that is connected to the board so...i guess the problem is not there, but thanks for the hint.

    I will disassemble my pc and clean all the parts and try to look for some short circuits. Thank you also for this reply myjosh007 , i will let you guys know how it go's...

    Thanks again.

  • Anonymous Feb 28, 2009

    ok , yes, i don't use thinner it's too agressive , i have an industrial cleaner for electronic circuit boards that i use, so i cleaned the whole bord , took off everything except the cpu and cleaned and visualy inspected the whole board. Everything seems to be alright. After reinstalling the MB back into it's case ,i only connected the boot hdd and NO usb or other connection except for the powerswitch. I tried to power up the board but it doesn't work , so the cleaning job didn't help ! Then i cleared the cmos , took out the battery and shortend the pins, then tried again , no power up.
    So, ? has anyone have any sugestions i might try ??

  • kope436 Feb 28, 2009

    oww, sorry , the reply of the 1 other user is me !! Koen , I sent it the wrong way , but as you can read i did all you said and i still have the same problem, the board won't start , even with nothing connected....

  • Eric Lanning May 11, 2010


    If you are not careful you will destroy your motherboard.

    I personally don't think you need laquer thinner at all. Use at your own risk.

  • Eric Lanning May 11, 2010

    It almost sounds like there is not enough power to the system. But you put a 620W into it.

    Do you have any USB Hubs attached? If so, how old is it? What USB devices are attached?

    Does the system startup good everytime, if all USB devices are unplugged? If it does, disconnect one device at a time. Eventually you may find that it is only one USB device that needs to be unplugged. It could signify that the USB device is having issues.

    Hope this sets you in the right direction.


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Hi im josh in cebu phils. may i help you? friend in your problem all i can say is there is a what we called short cicuit between your power source and the motherboard thats wy when you put the usb it will turn on normaly because your usb is the one igniting the powersource and it will not make the usb good because as time goes your usb is always at risk because it serves as the load. Friend mainboard is made up of many transistors capacitors, diodes and the IC or integrated circuit these IC is auto shut when there is a short circuit happening on your mainboard so thats why whn you turn it on it will the because the IC will shutoff because there's short circuit happeing. and every time you put the usb it will turn on because the usb will be the one to absorb the short circuit at will act as a load and thats the time your IC will work and the pc turns on. to solve such problem try to disassemble your pc.remove everything,and clean every parts of it. if you have the lacquer thinner that is the best solution for cleaning just put a little of it on the brush and brush the parts of your motherboard then after you let it dry for sometime then assemble it again. this will solve your prblem.we had tried this many times and it works. so try to do it. good luck hope i helped you.

Posted on Feb 28, 2009

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