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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Re: CPU fan not detected.....

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

Re: CPU fan not detected.....

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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Re: CPU fan not detected.....

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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Re: CPU fan not detected.....

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

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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 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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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.

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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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