Mac Mini load fan noise

[tompatrick]

Hi all, I noticed my mini cpu fan went loud just after I pressed the start button. I faced similar problem last month & shut down the system. Detached all connections & reattached them. It worked fine. I want to know why cpu fan goes loud and is it something to worry?

 

[Kaveman]

The fans normally go full until the system software monitors all the temperature sensors, then it spins the fans down to the right speed. That way if a sensor fails it doesn't cook the device.

 

[tompatrick]

OK but how often it does that? I noticed only couple of times in the last 1 year.

 

[oldscribe]

Hi,

As far as I am aware it is your MacOS X that controls the fan, so it is entirely possible that behavior between systems will vary based on the MacOS X install itself. As such, I must ask if this occurs with a screen saver or is it across the board so to speak?

You may be getting this fan noise as a result of something else on your system which is interfering with the MacOS X install.

 

[tompatrick]

Thanks for the reply!!!

I am sharing what happened today.

I came to office and pressed the power button on Mini. The light took time to show up. Now this is first indication that fan will go loud. And yes, after 5-8 seconds, when white light came on CPU, the fan become aloud. I restarted from the login screen and that didn't help. So, again from login screen I shut down the Mac.

Every time, the below process has helped me, including today.

When my Mac shut down completely, I switch off the power button & take out all connections & then reapply all connections and switch on the power source. Then I press the power button of Mini and it boot normally.

So it might be the power source itself coming from the switch board?? Can't be sure though.