Why does my computer fan turn on randomly?

Over time, dust and others come into the laptop through the vents. That dust will settle in thick packets onto the cooling areas, making them less effective. At some point, even on idle will the laptop need to turn on the fans to reduce heat buildup. Fans spinning and temperatures have everything to do with each other.

Why do my PC fans keep stopping?

There are three main reasons why your CPU fan is not spinning properly: the fan is clogged with dust, wires might get stuck in the fan or the fan does not get enough energy supply to spin. Getting rid of these causes might get your CPU fan up and running again.

Should my computer fan always be running?

Computer fans constantly run during normal use to cool computer components and prevent overheating. Many computers produce operational temperatures in the hardware-damaging range during normal use and require continuously running fans to not only prevent overheating, but perform optimally.

Should CPU fan run all the time?

Is it normal for CPU fan to stop?

Remember that it is normal behavior for the CPU fan to stop spinning when the CPU temperatures are low or you are not running any power-hungry applications. In order for your computer to function at its optimum, cooling is essential.

Should CPU fan ever turn off?

Yes, the fan should always be on. It will not however always be at the same RPM depending on your fan controller. That being said there are several reasons for a fan to stop spinning, most of them related to age. Since it starts to spin at boot up and then later stops it is probably dirty.

Can dust ruin a computer?

The main risk with dust is that it can cause your computer to overheat. It’s unlikely that dust on the internal components will stop the computer functioning, but overheating could. If dust blocks up your fan and cooling system, your desktop computer could be at risk of overheating.