Gigabyte GA-945GCM(X)-S2 - CPU Fan no go

  • Thread starter Thread starter T Jones
  • Start date Start date
T

T Jones

Hi,

I've built two PC's using this mobo, with the Intel Core 2 Duo (LGA775)
CPU. Problem is that one mobo started up just fine, with all cables
connected, whereas the other one has the problem of the CPU fan not spinning
up at start, then stopping immediately.

After a lot of mucking around, I purposely left the ATX_12V 4 wire power
connector plug off. Now the CPU fan starts up and stays that way! Does this
mobo/CPU confirmation not need that ATX_12 power connector? Any ideas
anyone?

Thanks.
 
On Sep 15, 11:28 pm, "T Jones" <speedil...@hotmail.com> wrote:
> Hi,
>
> I've built two PC's using this mobo, with the Intel Core 2 Duo (LGA775)
> CPU. Problem is that one mobo started up just fine, with all cables
> connected, whereas the other one has the problem of the CPU fan not spinning
> up at start, then stopping immediately.
>
> After a lot of mucking around, I purposely left the ATX_12V 4 wire power
> connector plug off. Now the CPU fan starts up and stays that way! Does this
> mobo/CPU confirmation not need that ATX_12 power connector? Any ideas
> anyone?
>
> Thanks.

This is not a question about "Windows XP" but a question for the
GigaByte news group. Please locate that group.

Also, the 12V 4 pin power IS important. It is to provide the required
additional power to the CPU.
 
T Jones wrote:
> Hi,
>
> I've built two PC's using this mobo, with the Intel Core 2 Duo (LGA775)
> CPU. Problem is that one mobo started up just fine, with all cables
> connected, whereas the other one has the problem of the CPU fan not spinning
> up at start, then stopping immediately.
>
> After a lot of mucking around, I purposely left the ATX_12V 4 wire power
> connector plug off. Now the CPU fan starts up and stays that way! Does this
> mobo/CPU confirmation not need that ATX_12 power connector? Any ideas
> anyone?
>
> Thanks.
>

One person yesterday had a problem, where their power supply wiring was wrong.
That is pretty rare, but if the 12V (two yellow wires) and GND (two black wires)
don't line up with hole labeled as such in the user manual, the supply can get
shorted and shut down.

The invention of the 20+4 main connector, was not defined by a standards body.
The 24 pin connectors on new supplies, on a lot of them, the 4 pin section slides
off. Note that the 4 pin section that slides off, has four different color wires,
and yet it still fits in the ATX12V 2x2 connector. Some people grab that by
accident and plug that into the ATX12V hole, and that is not good at all.

It is also possible, for something to short to the bottom of the motherboard.
Or even, for there to be a short within the motherboard itself. Plugging the
ATX12V 2x2 into a set of holes that are shorted, will also cause the supply
to shut down. Removing the motherboard from the computer case, and sitting
it on top of a piece of cardboard (for insulation), will at least eliminate
a standoff as the cause of the shorting.

The manual should have a picture of the main power connector pinout, so you
can check that the two yellow wires on the ATX12V 2x2, are going to 12V pins
on the motherboard.

Even the power supply could be bad, but the symptoms look like the problem
is outside of the supply.

Paul
 
On Sun, 16 Sep 2007 13:28:35 +1000, "T Jones" <speedilink@hotmail.com>
wrote:

>Hi,
>
> I've built two PC's using this mobo, with the Intel Core 2 Duo (LGA775)
>CPU. Problem is that one mobo started up just fine, with all cables
>connected, whereas the other one has the problem of the CPU fan not spinning
>up at start, then stopping immediately.
>
> After a lot of mucking around, I purposely left the ATX_12V 4 wire power
>connector plug off. Now the CPU fan starts up and stays that way! Does this
>mobo/CPU confirmation not need that ATX_12 power connector? Any ideas
>anyone?
>
> Thanks.
>
>
And this has exactly WHAT to do with the OS? Reread the title of this
group then ask yoursef: Does this post belong here? I'll save you
the deep thought on the answer: NO NO NO NO NO NO NO NO NO

Ask in a hardware group.
 
Who appointed you policeman? It was a bloody XP hardware problem, thanks, as
per the group name: windowsxp.hardware! Smartsarse!

"NoConsequence" <none@none.net> wrote in message
news:a2mre317ua6l9tmktptt6phdff2csmjcqe@4ax.com...
> On Sun, 16 Sep 2007 13:28:35 +1000, "T Jones" <speedilink@hotmail.com>
> wrote:
>
>>Hi,
>>
>> I've built two PC's using this mobo, with the Intel Core 2 Duo
>> (LGA775)
>>CPU. Problem is that one mobo started up just fine, with all cables
>>connected, whereas the other one has the problem of the CPU fan not
>>spinning
>>up at start, then stopping immediately.
>>
>> After a lot of mucking around, I purposely left the ATX_12V 4 wire
>> power
>>connector plug off. Now the CPU fan starts up and stays that way! Does
>>this
>>mobo/CPU confirmation not need that ATX_12 power connector? Any ideas
>>anyone?
>>
>> Thanks.
>>
>>
> And this has exactly WHAT to do with the OS? Reread the title of this
> group then ask yoursef: Does this post belong here? I'll save you
> the deep thought on the answer: NO NO NO NO NO NO NO NO NO
>
> Ask in a hardware group.
>
 
Perhaps you may relate to the group what difference the operating system
has to do with your problem? Maybe you could post in the office group
because you have an ofice application installed on the PC too?

T Jones wrote:

> Who appointed you policeman? It was a bloody XP hardware problem, thanks, as
> per the group name: windowsxp.hardware! Smartsarse!
>
> "NoConsequence" <none@none.net> wrote in message
> news:a2mre317ua6l9tmktptt6phdff2csmjcqe@4ax.com...
>
>>On Sun, 16 Sep 2007 13:28:35 +1000, "T Jones" <speedilink@hotmail.com>
>>wrote:
>>
>>
>>>Hi,
>>>
>>> I've built two PC's using this mobo, with the Intel Core 2 Duo
>>>(LGA775)
>>>CPU. Problem is that one mobo started up just fine, with all cables
>>>connected, whereas the other one has the problem of the CPU fan not
>>>spinning
>>>up at start, then stopping immediately.
>>>
>>> After a lot of mucking around, I purposely left the ATX_12V 4 wire
>>>power
>>>connector plug off. Now the CPU fan starts up and stays that way! Does
>>>this
>>>mobo/CPU confirmation not need that ATX_12 power connector? Any ideas
>>>anyone?
>>>
>>> Thanks.
>>>
>>>
>>
>>And this has exactly WHAT to do with the OS? Reread the title of this
>>group then ask yoursef: Does this post belong here? I'll save you
>>the deep thought on the answer: NO NO NO NO NO NO NO NO NO
>>
>>Ask in a hardware group.
>>
>
>
>
 
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