CPU Fan Not Detected

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2 Questions: My CPU fan recently stopped working. I had it replaced but the repair shop told me I would not be able to do anything about the error message on startup of, "CPU FAN NOT DETECTED" and that I would have to press F1 each time on startup in order to continue. Is there any way to remove this message?

Also, how do I create a default OS so that I do not have to choose from the list of 2 at each startup? These two issues are quickly becoming an annoying start to booting up my computer.

Thank you.
 

captaincranky

TechSpot Addict
It must be working hard, Listen to all the noise

jonathanreuter2 said:
2 Questions: My CPU fan recently stopped working. I had it replaced but the repair shop told me I would not be able to do anything about the error message on startup of, "CPU FAN NOT DETECTED" and that I would have to press F1 each time on startup in order to continue. Is there any way to remove this message?

Also, how do I create a default OS so that I do not have to choose from the list of 2 at each startup? These two issues are quickly becoming an annoying start to booting up my computer.

Thank you.
Did the repair service install a 4 wire or 3 wire fan? Many boards have PWM fan monitoring which requires a 4 wire fan. Is the fan speed still being controlled by the mobo? I find it intriguing that the shop knew it wouldn't work correctly before you took it home.
 
It was replaced with the same exact fan from another Dell Dimension 2300, however, the message won't stop but I don't know why. I also figured that he should have known how to stop it, since i'm being charged money by this "professional". I will check on the wiring situation as soon as I can. Thanks.
 

smaurer69

TS Rookie
You might be able to fix it in the bios under the hardware monitor tab or something. That does sound really strange though if he replaced it with the same exact fan. It sounds like your missing an extra lead for connecting the RPM sensor
 

captaincranky

TechSpot Addict
Whaling Stories... Fact or Fiction

jonathanreuter2 said:
It was replaced with the same exact fan from another Dell Dimension 2300, however, the message won't stop but I don't know why. I also figured that he should have known how to stop it, since i'm being charged money by this "professional". I will check on the wiring situation as soon as I can. Thanks.
The color coding of fan wires is, I believe universal.
1. Black = Ground
2. Red = + 12 Volts
3. Yellow = Tachometer
4. Blue = PWM (pulse width modulation) The processor & auxiliary fan speed
control wire.
You can connect the fan connectors (NOT THE BIG MOLEX TYPE) either three or four wire to either 3 or 4 wire fan headers on the motherboard. The plugs fit they just skip a pin. But, the fan will either run full speed or on it's lowest depending on which pin is missed, the fan's or the board's.
It my Intel (and I can only speak directly to this type) board G965W (which has PWM control for the processor, you can tell the BIOS to not bother to detect new fans. However, I don't think you can tell it not to detect the processor fan. I'm not stupid enough to try that anyway. (Under Advanced>hardware settings). Unless you can tell me that the old fan took out the PWM board circuits and left the power headers intact (I believe that this could be possible, although not likely) Somebody's tellin' stories at the repair shop.
 
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