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CPU and case fan spin down while running


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Unread 13-06-2008, 03:18 AM   #1
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CPU and case fan spin down while running


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...

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

Thanks in advance for any advice

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Unread 29-04-2010, 07:10 PM   #2
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Re: CPU and case fan spin down while running

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You have made a lengthy post but the problem is not that uncommon. You are right in asserting the real cause of the dysfunction of CPU and Case fan of your PC in last part of your post. It is a simple case of motherboard incompatibility issue . In most of the Intel i865 chipset OEM motherboard, there are such problems. I have faced that. Just change it to a new all INTEL Original mothers everything would be back to normal.

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