CPU Fan Has Failed! PC will automatically power down

 CPU Fan Has Failed! PC will automatically power down
HP Pavilion Slimline s3714uk Desktop PC, running windows 7.
I started to get CPU fan failure message  and the PC would not boot, I opened up the case and the CPU fan seems to be connected and working.
Error message is “"ERROR: CPU Fan Has Failed! PC will automatically power down in a few seconds. Service the PC immediately to prevent damage to the PC."
I have found the following advice:
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00013522&cc=uk&lc=en&dlc=en&product=3876701
However the bios version I have does not have the option to switch off the fan monitor. How can I fix this issue please: many thanks

Hi Susielee.  what was the heat sink and cpu fan that the tech installed in your HP computer?  I got a used HP s5120y computer from a longtime friend that is missing a processor fan but the heatsink is there.
update 2/14: never mind, my old friend forgot to give me the CPU fan, which he did a few days ago.  I used a flashlight to check if the fan is working and it is but I'm still getting "CPU fan has failed" error everytime I power on the computer but the cpu fan spins okay at normal speed.  replacing the cmos battery did nothing to solve the problem.
I will either replace the whole heatsink & fan before I will consider replacing the motherboard, which seem to have a least 1 ruptured capacitor on the board - that indicates some parts of the motherboard are starting to fail, like the fan sensors.  The HP part number of the board printed on a sticker in the HP slimline S5120Y computer is "513426-001"
So in short replace the heatsink & fan assembly first.  Then replace either the power supply and chassis fans.  If those don't fix the CPU fan failed message at bootup, replace the whole motherboard.

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