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BIOS error " Alert: CPU fan not detected"

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Hi all:

The CPU fan for my Dell Dimension 2350 desktop computrer stopped working and I got the BIOS error "Alert: CPU fan not detected". So I replaced the CPU fan and the fan works good but now I get this error message when ever I turn my PC on. When I press the power button, I get the Dell logo and I get the Phoenix-Award BIOS screen with the error message "Alert: CPU fan not detected. Press F1 to continue,F2=SETUP,......". When I press F1 the system continues to boot fine and the Pc works fine. My CPU is cooling fine also

The error message is very annoying aand I want to remove it or resolve the issue Please help.
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Neil Jones

Neil Jones

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The issue is usually caused because either the fan is spinning too slowly ( if a dynamic fan) or you've connected the fan to what is not the designated CPU fan connector. Most boards have the option of multiple fan takeoffs and while the CPU fan will spin if it's connected to any of these, usually one is specifically assigned for the CPU fan so the boards tend to be wired to it. Alternatively one can have a CPU fan that runs off a 4 pin connector from the power supply but the system will always complain that there isn't one plugged in.
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