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Thread: Faulty motherboard?

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    Faulty motherboard?

    yep......i'm here again.

    sorry >_<

    this is a question i've sent to abit/ebuyer/scan....

    when i say its setup properly it is, cos i had a comp mate come over to help me check it out etc.

    Hi,

    building a new system, everytihng is connected properly. The power goes into the motherboard and the lights go on to show power there (the red and green lights), but the system doesn't boot.

    The monitor gets no signal, looking closely it seems the power to the motherboard is being interupted for a millisecond as the green light momenterilly dips, and it sounds like it is in a loop. This happens every 10 seconds.

    We have the 24 pin connector from psu to mobo on. if i connect the ATX12v1 8 pin connector in, power comes on for about 2 seconds then goes off, which is in a loop again.

    Does it sound like a faulty motherboard, or something else faiiling?

    Would be grateful for a reply,

    many thanks.

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    Senior Member Lanky123's Avatar
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    Re: Faulty motherboard?

    Both those power connectors should be connected so keep them there. If you could list the components it might help. Try booting with just one stick of RAM, and then try with the other stick to rule out a dodgy RAM stick. Just checking you did apply thermal paste before putting the heatsink on? TBH it could well be a motherboard issue but it's best to rule out other things.

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    Re: Faulty motherboard?

    Tried just 1 stick of ram (each one), and that didnt work.

    yeah, there is coolant paste on the heatsink too.

    but yeah, the power like dips for a millisecond, so im just wondering ya no. that wouldnt be ram would it?

    the componenets are in my other thread, i'll get the link in a sec... *edit* http://forums.hexus.net/hexus-hardwa...lp-please.html

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    Re: Faulty motherboard?

    if it's an IP35 Pro what codes does the POST LED display?

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    Senior Member Lanky123's Avatar
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    Re: Faulty motherboard?

    Yeah I've never had a problem like this before (apart from just forgetting to plug things in lol) so I'm no expert really, just suggesting the usual things. You don't have a spare PSU to try do you?

    Is there anything in the motherboard manual about beep codes (or LEDs) when a problem occurs?

    Just checking, these are the components?

    Corsair 4GB Kit (2x2GB) DDR2 800MHz
    ABIT IP35 Pro
    Coolermaster CM690 Dominator Black Mid Tower Case
    Western Digital WD6400AAKS 640GB
    650W TX Corsair PSU
    896MB Gainward GTX 260
    Intel Core 2 Duo E8400

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    Re: Faulty motherboard?

    yeah, those are the components.i dont think anything else missing.

    the motherboard has two leds...one lights red when there is power, and another green when the power is working (ie. when you press on).

    these both show, but go for a millisecond when this power 'dips'. and no, unfortnuately i dont have a spare psu :{ but it's brand new, so meh ;x

    and also, theres like a display just below the graphics card slot, in line with the leds, and before pressing on its at .1 then when on it goes to like 8.7 ;x i dunno what that means, and cant find it in the book...

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    Senior Member Lanky123's Avatar
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    Re: Faulty motherboard?

    Well the pdf manual seems to suggest 8.7 is 'check CPU core voltage'. Page 82/88, it might be the same page in your manual. In the Appendix, 5.1 Post code definitions. Try resetting the CMOS but I doubt it'll do anything on a new mobo.

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    Re: Faulty motherboard?

    most common cause of 8.7. is not having the ATX12V1 connected.
    Can also be seen with pin damage on a CPU & iirc for a CPU unsupported by BIOS (i.e. process change) but imo the latter is unlikely on an IP35 Pro/E8400 as it would have to be a very old mobo not to have a 45nm BIOS on it.

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    Re: Faulty motherboard?

    thing is, wwhen we add the 12v1 connecter, it is even worse. i get the 2 second power then off again loop. without it we have power, which fades for a millisecond.

    so do you lot think it is faulty mobo? or psu? (sorry, some of the techno language still confuses me, but i 'm trying to learn it ^^ )

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    The late but legendary peterb - Onward and Upward peterb's Avatar
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    Re: Faulty motherboard?

    What make and claimed power output is the PSU? (Power Supply Unit)
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    Re: Faulty motherboard?

    Suspect is the PSU. Antec NEO series is essntially a budget component PSU.
    I have a search round on the Abit USA forums and there are a number of threads relating to Antec PSU's.

    Have a read.

    http://forum.uabit.com/showthread.php?t=137358

    http://forum.uabit.com/showthread.php?t=137248
    As Buff has pointed out 8.7 is not having the ATX12V1 connected.

    If it gets worse as you have suggested then it is PSU related. It is displaying all the issues that show in the two threads above.


    OOPS should have read further on his link. Sorry guys.
    Last edited by DratUK; 07-09-2008 at 06:24 PM. Reason: Wrong PSU
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    Re: Faulty motherboard?

    That would bevery interesting if he had that PSU. His post says he has a Corsair.

    Anyway, what the OP is saying is that if he doesn't connect the ATX12V1 he gets an error message to that effect (doh!). What he needs to tell is what the code is when he DOES connect it.

    If he put coolant paste on the HSF and on the CPU that's too much paste. I wouldn't have thought that would lead to the described symptoms though. Maybe it's a short - best way to check this is a minimal component build on cardboard outside the case - start with CPU & 1 stick of RAM only, then video, etc.

    I also have to ask, given that the 12V1 wasn't connected (which makes me doubt that this 'comp mate' is much use), has the PCI-E power been connected?

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    Re: Faulty motherboard?

    Quote Originally Posted by Thorsson View Post
    That would bevery interesting if he had that PSU. His post says he has a Corsair.

    Anyway, what the OP is saying is that if he doesn't connect the ATX12V1 he gets an error message to that effect (doh!). What he needs to tell is what the code is when he DOES connect it.

    If he put coolant paste on the HSF and on the CPU that's too much paste. I wouldn't have thought that would lead to the described symptoms though. Maybe it's a short - best way to check this is a minimal component build on cardboard outside the case - start with CPU & 1 stick of RAM only, then video, etc.

    I also have to ask, given that the 12V1 wasn't connected (which makes me doubt that this 'comp mate' is much use), has the PCI-E power been connected?
    hehe, yes, if i had that psu.

    as for the 12V1, yes, the pci-e has been connected ofc. and no, he put the 12v1 in for me, i hadn't put that bit in, since it was abit elusive in full description. but what im saying is wih the 12v1 in it's worse; power for 1 sec, then off for 3.


    but reading those other 2 threads, although ot my psu, it sounds exactly the same really, so i'm inclined to think it is the power supply being faulty.

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    Re: Faulty motherboard?

    Just to make sure, you have put in all 8pins of the connector and not just 4. Sometimes boards blank off 4 of the pins for some reason, if this is the case you would need to pull the blank out.

    Probably not helpful but just a thought.

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    Re: Faulty motherboard?

    yeah, all 8 are in. here's how it stands;

    24 pin, nothing else = power, 10 seconds there's a blip, restarting of power

    24 pin + 4 pin = abit of power, few secs, then noting for few seconds,

    24 pin + 8 pin = power for half a second, 3 seconds off.


    so yeah... faulty psu it sounds like?

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    Re: Faulty motherboard?

    Have you buily the PC outside the case? Do you have another PC to test the PSU?

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