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512 Chassis fan not detected

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hp compaq ultra slim dc7100
Microsoft Windows XP

what is the solution about this problem , 512 xhassis fan not detected, i already buy a new fan and installed it 

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There are two different possibilities: sensor and fan.


In terms of the first, the sensor that detects a connected fan (one using the proper fan connector) has failed -- and if that is the case, there is nothing you can do about it.  You would check this by connecting a fan that is KNOWN to work and to be connected using a different motherboard or fan port.


In terms of the second, the fan circuitry has failed -- and you would check this by connecting a KNOWN working fan.


Not all fans are alike, even if they look the same, so you would have to try different ones -- but if you consistently get the warning message, the safe bet is that the onboard sensor has failed.

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