Solved Cpu fan keeps running.

Dell / Poweredge r210
June 28, 2014 at 23:33:54
Specs: Windows 7 32bit, Pentium 4/4gb
I am using an old Dell optiplex desktop computer. Lately the CPU fan starts running at the same time I press on the Power button and never stops running till I shutdown the computer. I have dusted off inside the computer and even clean up underneath the heatsink and apply new thermal paste. Still the fan never stops. What can be the cause of it?

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✔ Best Answer
June 29, 2014 at 00:47:19
The CPU Fan are made to spin till the computer shutdowns, its just that sometimes you don't notice its spinning because of its low spinning speed which generates no noise.

As you said its keep spinning that means its spinning at more speed than before. The causes for it are something is hogging you CPU power & CPU heats up, so to lower the CPU temperature the FAN spins at its max speed making noise, check Task manager for CPU consumption.

The another problem can be someone has messed with your BIOS setting and configure it to spin at max spin all the time.

Also check if your CPU fan is plugged where it should be and not in system FAN pins or it will keep spinning at max speed.

NOTE : A CPU fan should spin all the time as long as your computer is on otherwise it will end up burning your CPU.

Why be born again when you can just grow up?



#1
June 28, 2014 at 23:40:48
That sounds normal to me.

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#2
June 29, 2014 at 00:01:42
what I meant here is The fan keeps running without stopping at anytime. It used to be running on times a application is running.(which I assume then the cpu getting heats up and the fan tries to cool it down) Now it's not like that. It starts running and never stops till the computer shuts down.

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#3
June 29, 2014 at 00:35:39
You can check the bios settings. See if there's something like an 'always on' option for the fan. The bios might also show the temps. It might be running a bit hot. But it's probably not something to worry about as long as the temps stay reasonable.

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Related Solutions

#4
June 29, 2014 at 00:47:19
✔ Best Answer
The CPU Fan are made to spin till the computer shutdowns, its just that sometimes you don't notice its spinning because of its low spinning speed which generates no noise.

As you said its keep spinning that means its spinning at more speed than before. The causes for it are something is hogging you CPU power & CPU heats up, so to lower the CPU temperature the FAN spins at its max speed making noise, check Task manager for CPU consumption.

The another problem can be someone has messed with your BIOS setting and configure it to spin at max spin all the time.

Also check if your CPU fan is plugged where it should be and not in system FAN pins or it will keep spinning at max speed.

NOTE : A CPU fan should spin all the time as long as your computer is on otherwise it will end up burning your CPU.

Why be born again when you can just grow up?


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#5
June 29, 2014 at 01:56:58
As already stated the CPU fan spins all the time. The speed varies under certain conditions, such as CPU load, air flow or user configuration. It all has to do with heat reduction.

Sounds like the fan is now clearly audible because it is running at high speed either to cool the system or because it has been set to run this way.

Try checking the heat sink (directly underneath the fan) for clogging.sorry I see you've already done this. Also check your system for malware if you haven't installed software that could cause this immediately prior to you noticing the fan.

One last thing that has occurred to me is that your CPU fan has suddenly become noisy. It might just be old and worn out.

message edited by btk1w1


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#6
June 29, 2014 at 07:41:03
"I have dusted off inside the computer and even clean up underneath the heatsink and apply new thermal paste"

If you applied the paste incorrectly, it will cause the CPU to run hot & the fan to run constantly rather than intermittently. I see you have a P4, is it a single core? It makes a difference. See the following:

http://www.buildcomputers.net/cpu-t...


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