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    Faulty Motherboard

    Bought a second hand motherboard with CPU and fan attached. Board lights up, nothing flashing all green but then when power button pressed the fans turn once and everything shuts down. Tried with and without ram nothing else attached except power. I'm assuming the board has a fault ? not fitted one for a number years so bit out of practice. Seem to have expect at least some beeps if it was anything but the board itself.

    19 Comments

    What board and processor? If it's a newer CPU on an older 1st gen board for that generation it might need a bios update, which you can't do without a compatible CPU unfortunately.

    Otherwise yes, sounds like it could be faulty. You will need ram in it to boot up, but can remove ssd and PCI cards and boot from onboard graphics.

    Edit, read it again and it seems like the CPU was already in the board when purchased. Could be faulty then, or a short somewhere, or damaged by static (which is quite hard to do actually)
    Edited by: "jaydeeuk1" 18th Apr

    Try removing the CMOS battery for 10 minutes, then replacing it before trying.

    Is it an Intel chip? Check if socket pins are damaged. It's a seller trick to sell a faulty board with a fitted cpu so you don't see the damaged pins. Had it a few times myself. Also might be ram not sat properly, try taking out and resitting.

    Original Poster

    It's intel 3rd gen with i5 processor. it's from a trusted supplier who has already offered to send a replacement even-though they tested fully before sending it out. I'll wait till that arrives before disturbing the process and fan setup.

    I'm questioning myself really because this started with me moving a working setup that hadn't be used for 6 months to a new case and that board not working. Before you ask I've checked with two working power supplies. So rather mess with this one I decided to upgrade the board and cpu.

    Has it got onboard graphics? if not you will probably need to plug in a video card, also try resetting the bios, unplug the power, remove the battery, and short the bios reset pins for 10 sec, are you sure your ram is good and the right type?, if so try one stick and try it in each slot starting with the slot nearest the cpu

    Original Poster

    stoneblade

    Is it an Intel chip? Check if socket pins are damaged. It's a seller … Is it an Intel chip? Check if socket pins are damaged. It's a seller trick to sell a faulty board with a fitted cpu so you don't see the damaged pins. Had it a few times myself. Also might be ram not sat properly, try taking out and resitting.



    Tried without out ram, should still boot but beep. Not even getting that far, fans turn about a quarter and it turns off.

    Original Poster

    scottswaha

    Try removing the CMOS battery for 10 minutes, then replacing it before … Try removing the CMOS battery for 10 minutes, then replacing it before trying.



    Are yes, that rings a bell, been about 5 years since I open a PC :-) I'll try that.

    Original Poster

    jaydeeuk1

    What board and processor? If it's a newer CPU on an older 1st gen board … What board and processor? If it's a newer CPU on an older 1st gen board for that generation it might need a bios update, which you can't do without a compatible CPU unfortunately.Otherwise yes, sounds like it could be faulty. You will need ram in it to boot up, but can remove ssd and PCI cards and boot from onboard graphics.Edit, read it again and it seems like the CPU was already in the board when purchased. Could be faulty then, or a short somewhere, or damaged by static (which is quite hard to do actually)



    Yes I've built 100s but not for sometime, never had a faulty board before. Even without the ram it should still beep shouldn't it? light come one, power is there to the button but pushing the button just gives a tiny sign of life then it's off again.

    Original Poster

    mikey_d

    Has it got onboard graphics? if not you will probably need to plug in a … Has it got onboard graphics? if not you will probably need to plug in a video card, also try resetting the bios, unplug the power, remove the battery, and short the bios reset pins for 10 sec, are you sure your ram is good and the right type?, if so try one stick and try it in each slot starting with the slot nearest the cpu



    Yes.

    Is the cpu power supply ( small 4 pin plug ) connected?

    Original Poster

    mikey_d

    Is the cpu power supply ( small 4 pin plug ) connected?



    No this board does even have that socket but good answer.

    Remove motherboard from case.i.e place on table top. Then power on.
    Could be screws are not in correct holes attaching to case. Or motherboard board is touching bottom of case etc causing a short.
    Had this myself before .Took me hrs to figure it out.

    PulisOut

    No this board does even have that socket but good answer.



    Is the CPU a low power unit? What motherboard is it. Can't think of a LGA1155 mobo that doesn't have a 4 pin or 8pin CPU power connector.

    Original Poster

    GAVINLEWISHUKD

    Is the CPU a low power unit? What motherboard is it. Can't think of a … Is the CPU a low power unit? What motherboard is it. Can't think of a LGA1155 mobo that doesn't have a 4 pin or 8pin CPU power connector.



    Sorry my mistake, I think we found the problem just don't have time to test tonight, Thanks.

    Do you have a hard drive connected? because that's typical behaviour of a hard drive with a TVS Diode gone.

    Unless you have a short somewhere, like the back of the mobo touching the case.

    What you describe is the power supply going into overcurrent protection mode and shutting down.

    PulisOut

    No this board does even have that socket but good answer.


    Not heard of a board that doesn't have one

    Possible faulty cpu. try a different cpu if possible.

    Also a good idea to check for shorts, especially in the USB's.

    Sounds like an electrical problem.
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