Mainboard doesn't recognize my cpu cooler

I have Vantec Aeroflow VA4-C7040 Socket-A
but whenever i boot up my cpu it says cpu fan is not
working even thouhg it is working great
i plugged cpu fan correctly
is ther anyone who could help me? ?(

I just discovered the same situation with my MSI-6585 (648 MAX L) mainboard.
I just replaced my stock Intel Heatsink and Fan with the Vantec AeroFlow VP4-C7040.
When I did, I started hearing an annoying beep. A peek in the bios shows the CPU Fan RPM Speed reading at 0. I disabled the beep.
I use a Vantec Nexus Fan Control Panel, and it correctly displays the fan's speed and also allows me to control it through the on-face pot. For those who think it's because the RPM is too low for the motherboard to read, think again. I can vary the RPM between 2400 and 5200 rpm, and I never get a motherboard reading. The fan controller seems to work without a hitch.
Incidentally, just for grins I hooked up my stock Intel fan again and it works fine, both directly connected to the 648 MAX and when connected to the Nexus Panel. From both connections I can get the RPM reading from the motherboard no problem.
I tried hooking up the Aeroflow directly to the 648 MAX to take the Nexus panel out of the loop, and got the same result: CPU FAN RPM=ZERO.
It could be that MSI is using older code that isn't able to decipher the speeds on some of the newer fans. Or maybe it has something to do with the fact that the AeroFlow uses a TMD (Tip Magnetic Driving) fan as opposed to a traditional brushless rotor.
Annoying, but not terribly. Would be nice if it worked, though.

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Quote from: Grayone on 06-February-06, 00:55:59
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http://imageshack.us/photo/my-images/34/lnow.jpg/
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[attachthumb=1]

Quote from: Svet on 12-July-15, 00:01:53try remove power cord from the PSU:
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Mainboard doesn't recognize my cpu cooler

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