Loud CPU Fan On Early Start up

[Krok1g]

My CPU fan has recently been making a loud buzzing sound on the first boot of the day....if I let the PC run, after several minutes the noise goes away. However if i reboot right after windows has loaded, the noise is gone at startup. From what I've read, it sounds like a failing bearing, that quiets down once warmed up?....but why would the reboot fix what normally takes several minutes to go away? Also, its currently idle @ 10-12c, and the noise has never came back after a restart. Just want to confirm if my fan is or isn't failing.

 

[Krok1g]

bump

 

[Krok1g]

1 more bump before I order a new fan to be on the safe side of things....

 

[allocco91]

I'll try to help, but honestly don't know much about it. Do you think maybe you could use a program like SpeedFan to factor out the possibility of the problem being electrical? Is it a PWM fan plugged into a header?

 

[Krok1g]

Not sure exactly the model of the fan, it is a coolermaster. Speedfan doesn't even read my CPUs temperature, I have to use open hardware monitor for that. And when I do run speedfan, there are 3 fan controls with Pwm written next to them and all are at 0%. Not sure if that helps at all. and what would "plugged into a header" mean?

 

[allocco91]

On your motherboard, there will be 3 or 4 pins close to the CPU socket to plug in a fan specifically for the CPU. If it's 3 pins, you can't control the fan, but if it's 4 pins, there's 2 pins for sensor and control.

 

[Krok1g]

Ok just looked, there are 3 pins, however the plug from the CPU fan is a 2 pin socket. (1 pin still exposed) Edit: Sorry, I didn't unplug the fan, so it quite possibly could be 4 pins total, and 3 are covered.

 

[allocco91]

Try switching the connection so the opposite pin is exposed. I think the pin you want exposed is the speed sensor, because you can't control it anyway. If not, try connecting it via molex if it has that connection.

Edit: In that case, you want the control pin exposed.

 

[Krok1g]

Alright, attempted to do as you suggested, unfortunetly the plastic fittings only allow for the socket to fit on the bottom 3 pins.(Where it is). However I noticed when I took the case off that the sound IS still there when I thought it wasn't, just much quieter than the initial boot(very feint grinding noise).....which is further leading me to believe it is a bearing. I have a new PSU and GPU arriving tomorrow which is what had me concerned about this, I think I'm going to be safe about it and order a CPU fan to have on standby incase this fan does start failing. Thanks very much for trying to help allocco91

 

[allocco91]

Yeah, no problem. I bought a cooler master a few months ago on sale, used it once and then took it out because it was too loud. Gelid Solutions and Noctua have quiet PWM fans.