Question about Dell Dimension 2350 PC Desktop

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CPU fan not detected.....

Ok,so heres the deal.i replaced the fan on my Dell Dimension 2350,and every since then,it says CPU FAN NOT DETECTED at every startup.i can push F1 and it starts up and runs fine,it doesnt heat up or anything,but it is starting to get really annoying to have to push F1 every time i start my computer.i looked in the BOIS menu to see if i could bypass it and theres nothing in there.if you could figure out a way to get that error gone i would really appreciate it.thanks!!

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  • Anonymous Jan 14, 2008

    Dell 2350 CPU Fan not detected Fan is spinning

  • dgoogin88 Jan 14, 2008

    thank you very much!! ill look and see if i put the connector in wrong,and ill update my bios and see if that will fix the problam.thanks!!

  • gilly123 Jan 26, 2008

    I also have a Dimension 2350 and I have the same problem. It's annoying to keep pressing F1 to get the system to run. I upgraded the bios A02 but problem still exist. Can you please tell me how to get rid of this CPU fan not detected message.

  • Wayne Green Feb 13, 2008

    Have the same problem with my CPU fan not being detected and having to press F1 in order to start windows. Need to know where I can get a CPU fan.

  • sealcorp Apr 14, 2008

    I have a Dell Dimension 2350 that the CPU fan went out, and the CPU was fried. After replacing the CPU and the fan, we now get the to continue message at bootup. It says no CPU fan detected. During the meltdown, something with the sensor must have been damaged. I have checked the wiring, and the new fan is a replacement from Dell. I just want to be able to bypass the error, and have it continue the boot process. The BIOS rev is A02, and Dell offers no later BIOS on their page. Is there a way to bypass this error? Thanks for any help.

  • Bill227 Apr 30, 2008

    I am getting the 'CPU fan not detected' message on my Dell Deminsion 2350 and I also hear noise from the CPU fan. My problem is I can not find a conventional replacement. My question is can a universal CPU fan designed for my P 4 CPU be used in place of the fan and shroud from the factory?

  • tsedojbhutia Jun 29, 2008

    warning ! CPU Fan not spining ! Press {f1) to bypass

  • jmyer7777 Aug 31, 2008

    I am having the same problem. Checked the voltage at it is there, but the fan does not turn. Need help on this one.

  • 1high420 Sep 01, 2008

    I changed the cpu fan on my dell 2350 now i have to press f1 to start pc (cpu fan not detected) everything fine other than that.

  • Anonymous Apr 19, 2009


  • jimmya1952 May 18, 2009

    I have a Dell 2350 also. Fan is noisy and after every reboot I get CPU fan not dected and have to press F1 to continue. Thanks, Jimmy



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Use a 3 wire fan, switch the wires to correct placement i.e. black/red/white and everything works just fine, no more error

Posted on Feb 29, 2012


Often this issue can be resolved in many Dell desktops in the BIOS. If present, completely clear the event log. Then, if present, turn off keyboard error reporting. It worked for me on at least six Dells so far.


Posted on May 06, 2008

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The cpu fan has a three wire connector that connects to the mother board. Usually located to the right & up from the cpu. If yours is connected currently the wires may be miss aligned. From left to right the pins are: first pin ground/Black; middle pin 12v./Red & last pin rotation/Blue. There may be a bios update that address this issue. Dell does not give up information easly.

Posted on Jan 13, 2008

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There is a setting under the Power tab in the BIOS....ACPI Suspend Mode. Change this to S1 and save changes as Custom Settings in the Exit tab. This will resolve the issue. Just make sure your CPU fan really is operational.

Posted on Jun 14, 2010

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1 Answer

Cpu fan can't run on dell dimension

You can clean or replace the fan.
Get the manual from
You can download it free and look up the fan repair instructions.
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Dear dao,
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The fan on the CPU is not running fast enough or it is not running at all replace it before it cooks the CPU and the motherboard.

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Hope you can open the CPU and check the CPU fan. Try unplugging the fan power cable on motherboard and inseting again.
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The dell dimentions 2350

Ensure that both the case fan and CPU fan are dust free and spinning. I think it could be overheating and then shutting itself off to prevent damage

Feb 01, 2010 | Dell Dimension 2350 PC Desktop

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How to remove and replace cpu for dell dimension desktop 2350

the cpu is a intel remove and replace a cpu is very easy
This link may help it is the rong model but dictates the process
You will need to open the case and be carefull of statick
ab510a2.jpg look for the cpu heatsink
Remove the fan unscrwe on the top
then remove the silver part this is held on with clips
gentley remove the cpu and replace new one THE RIGTH WAY look for the corners on the cpu to mach up on the board
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Nov 24, 2009 | Dell Dimension 2350 PC Desktop

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i can help with the mouse & keyboard.
go into the bios on boot screen you press DEL i think then activate the USB mouse & keyboard option then save & exit.
there will be settings for the cpu fan in there somewhere but i can't remember where sorry.

Aug 16, 2009 | Dell Dimension 2350 PC Desktop

1 Answer

My CPU fan for my Dell Dimension 2350 has stopped turning!


If your fan is not turning at all then it is probably dead, the bearings are likely clogged with dust and such. The PC is shutting off because of heat buildup on the processor chip. You need to do an Ebay search for your model and order a fan right away. Continued running of your sysem without a fan will kill the processor and motherboard. You should be able to get a replacement fan for your computer for less than $15 including shipping. Your local computer store may have one to fit your system but they may charge more for it. To change the fan is very easy, the left side of the case will come off your system, right under the power supply is the processor and heatsink and the fan. Disconnect the old fan and reconnect the new unit.

I hope this helps, if so please rate my solution

Corporate Computer

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Definitely check the power supply fan and the CPU fan for dust. Overheating could be the culprit, good luck.

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