CPU and case fan spin down while running
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Posted by E on June 12, 2008, 10:41 pm
Please log in for more thread options Hi I just bought a socket 478, Intel i865 chipset motherboard as a replacement for an Asus board that seemed to have a failed AGP slot. The Intel board is apparently new, a Gateway OEM board, ordered from PC Parts Unlimited... http://www.pcpartsohio.com/BookDetail.aspx?item_id=852 I installed the board, and hooked up everything 100%, confident that it would have no problems. But low and behold, as it was starting to boot into Windows, I watched the CPU fan spin down to 0 RPM. I shut it down immediately and started the PC again and it of course did the same thing, CPU fan came on with everything else, but then spun down after running for about 3-4 seconds. The CPU fan spin down seems to have no immediate affect on the rest of the system. It would be happy to boot up into Windows if I let it. I disconnected the case fan and hooked the CPU fan into the case fan header, and it still did the same thing. I completely removed the board from the case, layed it on a non-conductive surface, and powered it up. Still the same thing. I removed the heatsink/fan and plugged it into a spare fan header on an old 440BX board, and it ran fine. This heatsink/fan came with a retail boxed P4 CPU. I've tried both an Antec Basiq 500W, and Thermaltake 430W PSU just in case someone thinks its the power supply. Its strange that the CPU fan will shut down no matter what header it is connected to. On at least one occasion both the CPU fan and case fan spun down. It may be doing it every time, I don't leave it on long enough to watch the case fan spin down all the way. I'm thinking I will have to send the board back to PC Part Unlimited. I plan to email them first to see if they have any suggestions. Thanks in advance for any advice Eddie | |||||||||||||
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Posted by Paul on June 12, 2008, 11:50 pm
Please log in for more thread options If the board is worth keeping, you could bypass the powering issue, with a fan adapter cable. This one solves only the powering issue, and doesn't solve the need for the motherboard to get a fan RPM signal. The idea is, to get +12V and GND from a Molex disk connector, and onto an LP3. http://c1.neweggimages.com/NeweggImage/productimage/12-189-119-03.jpg This discontinued product from Antec, has two fan connectors per Molex power connector. The male three pin fan connector, provides +12V and GND to the fan, so it will run at full speed. The female connector, with the one white wire on it, carries the RPM signal. You plug the female, to the CPU fan header. By doing that, the RPM signal from the fan, is received by the BIOS. Some BIOS check for an RPM signal, and shut off the motherboard in a few seconds, if no CPU fan RPM signal is detected. http://www.antec.com/images/400/3_4pinfan_pwadapter.jpg So you may want a product something like the Antec one. Another example of an RPM enabled one, here. http://www.pctoys.com/840556028949.html Paul | |||||||||||||
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Posted by darklight on June 13, 2008, 3:40 am
Please log in for more thread options i have had this problem before,i would try shorting the reset pins. you
reset button might be faulty | |||||||||||||
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Posted by E on June 13, 2008, 10:13 pm
Please log in for more thread options Paul wrote:
> E wrote:
>>
>> Hi >> >> I just bought a socket 478, Intel i865 chipset motherboard as a >> replacement for an Asus board that seemed to have a failed AGP slot. >> The Intel board is apparently new, a Gateway OEM board, ordered from >> PC Parts Unlimited... >> http://www.pcpartsohio.com/BookDetail.aspx?item_id=852 >> >> I installed the board, and hooked up everything 100%, confident that >> it would have no problems. But low and behold, as it was starting to >> boot into Windows, I watched the CPU fan spin down to 0 RPM. I shut it >> down immediately and started the PC again and it of course did the >> same thing, CPU fan came on with everything else, but then spun down >> after running for about 3-4 seconds. The CPU fan spin down seems to >> have no immediate affect on the rest of the system. It would be happy >> to boot up into Windows if I let it. >> <snip>
>>
>
> If the board is worth keeping, you could bypass the powering issue, > with a fan adapter cable. > > This one solves only the powering issue, and doesn't solve the need > for the motherboard to get a fan RPM signal. The idea is, to get > +12V and GND from a Molex disk connector, and onto an LP3. > > http://c1.neweggimages.com/NeweggImage/productimage/12-189-119-03.jpg > > This discontinued product from Antec, has two fan connectors per > Molex power connector. The male three pin fan connector, provides > +12V and GND to the fan, so it will run at full speed. The female > connector, with the one white wire on it, carries the RPM signal. > You plug the female, to the CPU fan header. By doing that, the > RPM signal from the fan, is received by the BIOS. Some BIOS check > for an RPM signal, and shut off the motherboard in a few seconds, > if no CPU fan RPM signal is detected. > > http://www.antec.com/images/400/3_4pinfan_pwadapter.jpg > > So you may want a product something like the Antec one. Another > example of an RPM enabled one, here. > > http://www.pctoys.com/840556028949.html > Thanks Paul, I did think about getting some sort of an adapter to run the fans directly from the PSU, but was indeed worried that the BIOS would think that there where no fans connected. Didn't know the device you mentioned existed. But hopefully, I won't need to do this. See my reply to Calab. Eddie | |||||||||||||
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Posted by Calab on June 13, 2008, 10:26 am
Please log in for more thread options
> I installed the board, and hooked up everything 100%, confident that it
> would have no problems. But low and behold, as it was starting to boot > into Windows, I watched the CPU fan spin down to 0 RPM. I shut it down > immediately and started the PC again and it of course did the same thing, > CPU fan came on with everything else, but then spun down after running for > about 3-4 seconds. The CPU fan spin down seems to have no immediate affect > on the rest of the system. It would be happy to boot up into Windows if I > let it. Non-issue. My AMD dual core Opteron machine does the same thing. The fan is temperature controlled and only comes on occasionally. The fan runs full speed while the BIOS starts the PC, but once that's happened the fans spin down and Windows loads fine. What you need to worry about is if the heatsink is getting very hot, or if the BIOS temperature monitor shows the CPU temps shooting up. | |||||||||||||
> Hi
>
> I just bought a socket 478, Intel i865 chipset motherboard as a
> replacement for an Asus board that seemed to have a failed AGP slot. The
> Intel board is apparently new, a Gateway OEM board, ordered from PC
> Parts Unlimited...
> http://www.pcpartsohio.com/BookDetail.aspx?item_id=852
>
> I installed the board, and hooked up everything 100%, confident that it
> would have no problems. But low and behold, as it was starting to boot
> into Windows, I watched the CPU fan spin down to 0 RPM. I shut it down
> immediately and started the PC again and it of course did the same
> thing, CPU fan came on with everything else, but then spun down after
> running for about 3-4 seconds. The CPU fan spin down seems to have no
> immediate affect on the rest of the system. It would be happy to boot up
> into Windows if I let it.
>
>
> I disconnected the case fan and hooked the CPU fan into the case fan
> header, and it still did the same thing. I completely removed the board
> from the case, layed it on a non-conductive surface, and powered it up.
> Still the same thing. I removed the heatsink/fan and plugged it into a
> spare fan header on an old 440BX board, and it ran fine. This
> heatsink/fan came with a retail boxed P4 CPU.
>
> I've tried both an Antec Basiq 500W, and Thermaltake 430W PSU just in
> case someone thinks its the power supply.
>
> Its strange that the CPU fan will shut down no matter what header it is
> connected to. On at least one occasion both the CPU fan and case fan
> spun down. It may be doing it every time, I don't leave it on long
> enough to watch the case fan spin down all the way.
>
> I'm thinking I will have to send the board back to PC Part Unlimited. I
> plan to email them first to see if they have any suggestions.
>
> Thanks in advance for any advice
> Eddie
>