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CPU Fan Installed -- POST msg still says problem

I am installing an AMD Athlon 64 3200+ on an ASUS A8N-SLI Deluxe MB. The POST message is saying that there is no CPU fan, but it is there. I have seated it as best I can and clamped it tight. It is plugged in to the CPU_Fan connector on the motherboard. But the voice POST still says there is no fan! I used Arctic Silver between the heatsink and CPU, and I don't think it is leaking out anywhere -- I have double checked.

Any idea why it still doesn't see the fan?

-- ScribbleMeat
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ScribbleMeat
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ScribbleMeat
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2 Solutions
 
fruhjCommented:
is it a 3 wire fan?
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ScribbleMeatAuthor Commented:
Yes, it is.  Here is a link to the fan I bought (at Newegg.com) http://www.newegg.com/Product/Product.asp?Item=N82E16835186123
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fruhjCommented:
So it says the fan is spinning at 0 rpm right?
Have you tried any other fans?

Since the fan is working, my guess is that that somethings wrong with the feedback wire somewhere could be on the fan or the connector or MB.

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tmj883Commented:
Check BIOS for a low rpm setting and adjust accordingly...T
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ScribbleMeatAuthor Commented:
fruhj,

The MB has Voice POST. So the girl actually says "CPU fan failed." But just so you know, the fan is spinning.

-- ScribbleMeat
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ScribbleMeatAuthor Commented:
Let me ask this, does the MB care if the fan/heatsink is seated correctly? Or does it just check to see if the fan exists and is plugged in?

-- ScribbleMeat
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fruhjCommented:
That's awesome!  I haven't looked up your board, but I really like asus!

try plugging the CPU into another fan connector on the board - once you get the OS installed and the management software up - see if it thinks the fan at that connector is spinning - that'll tell you if it's the fan or the motherboard.

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fruhjCommented:
As an aside -
  I have an MSI board - lots of times right after coming out of sleep mode the MB monitor would say the fan was stopped. It would be fine 20 seconds later.

  So you might try and get into the bios and see what it says after it's warmed up a bit.

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fruhjCommented:
The motherboard is checking for a voltage on the 3rd wire.

One wire is ground, the other provides power to the fan.

The 3rd wire is like a feedback loop - the motherboard monitors this and guesses the RPM from it.

So the MB doesn't know/care about if you got it on right - the fan could be dangling in the case.

Hopefully the CPU has a thermal sensor that will shut off the CPU if the core gets too hot.  Most Intel CPU's do, and I think AMD has gotten this working in their latest processors too.
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ScribbleMeatAuthor Commented:
Well, it isn't having a problem now. I went into the bios and turned on some Q-Fan utility which for whatever reason shut her up about the fan. Thanks guys.

-- ScribbleMeat
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