cpu fan not detected

I have a dell Dimension 2350. When I boot the boot stopps and  a noter states CPU fan not detected. Then I have to press F-1 to ciontinue the boot. This may be the problem. Is it a problem and how can I fix it?

 
germanicus12Asked:
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smiffy13Connect With a Mentor Commented:
Open the case and make sure the fan is in fact spinning and connected to the correct header.

I got this from a Dell forum some time ago. I don't know what it exactly means: I don't have a Dell!, but it was the answer given to fix the same problem...

"In the BIOS...light up the Num Lock, Caps Lock, & Scroll Lock keys on your keyboard (they all should be lit green) and while holding down the ALT key, hit E (i.e. ALT-E).  The PC should beep once...now hit ALT-B to save changes and reboot.   If this does not work then try pulling the jumper on the system board that says either:  CLR_EISA or CLR_NVRAM"
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phototropicCommented:
Take a look at this:

http://www.experts-exchange.com/Hardware/Desktops/Q_21599329.html

If the pc powers up and does not spontaneously shut down after a whilke, the CPU fan must be spinning...

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BjornEricssonCommented:
Hi,
The first thing you can try without opening the case is to reset your BIOS. If I am not mistaken it would be the "del" key, but it varies with the manufacturer. Go into BIOS and load default settings which could eliminate that annoying error. If that is unsuccessful then you need to make sure that the fan is spinning. However, I used to work for a world-leading computer company and we encountered a similar error on some systems because there was a fault in the acctual cable. Try replacing the fan-cable if problem persists, or simply try another pin.
/B
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Visual3DMayaCommented:
This i think is happening because the signal from the fan sensor doesn't reach anymore the hardware monitoring controller. This could be due to a jumped fan connector or else.
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jnyostCommented:
Is this a three wire fan?  Make sure it is firmly seated and that third wire (yellow) is not cut.
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germanicus12Author Commented:
Thanks for the help. I did try everything you suggested. But I finally opened up the tower and I noticed that the battery fan was working but I had looked at the wrong one and the cpu fan was not. Open it up. Checked the wires so see if cut. Reset the bios.

Nothing. IN the end I just bought a new fan by mail because Dell doesn't let anyone sell its products in the stores. That bugs me. Sorry this system doesn't allow me it seems to split points. This is my first question.
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