I have a PC that displays the message "fan not working". Why is this message being displayed when the fan is working?

Nothing has been attempted thus far.



if you are sure that fan is working then only reason I can see is that sensor monitoring fan (on motherboard) is not working properly or broken
is this message displayed when you are starting PC or directly in Windows enviroment?
if this message is generated by some 3th party software it could be also problem of this SW (compatibility) and you can check SW provider update maybe



if you are sure that fan is working then only reason I can see is that sensor monitoring fan (on motherboard) is not working properly or broken
is this message displayed when you are starting PC or directly in Windows enviroment?
if this message is generated by some 3th party software it could be also problem of this SW (compatibility) and you can check SW provider update maybe



Check the BIOS settings and the fans actually installed. There are often extra fans for the case etc., and in many BIOS's you can enable those fans for monitoring too. If you have enabled such a fan in the BIOS that isn't even connected, you will get this type of error.



You can have many fans on a PC.

=) Most CPUs have one (although there may be only a big heat sink / watercooling)

=) At least one of these: Front fan, Side fan, Rear fan

=) There is also a rear fan on the back for the power supply
but that wouldn't cause your present warning.



Flash your BIOS to the most recent version.



The fans may be spinning, but may be too slow for adequate cooling.

You may want to clean the fans that are there now, with an air spray duster.

If the fault recurs, you could exchange any of the fans for a known good one, or look into SpeedFan for more monitoring:http://www.almico.com/speedfan.php

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