Cpu fan not spinning properly

No good news. A few minutes after my last post I noticed that the fan had stopped again (had to go out so didn't have time to post). It ran fine until I started Mozilla and then it stopped.

That made me think if it's maybe my PSU. The PSU has been making a hissing sound (last time I heard that sound the voltage regulator(or something like that) in my PSU was busted and I my microphone got to much voltage and just gave out static noise). I noticed the hissing sound when I swapped the fan out for a new one. I'm thinking that maybe the fan can't get the correct voltage and that's why it's not spinning.

Tomorrow I'll get another PSU from a friend, so I can test. But it's weird, because the fan ran fine for about 2 minutes at ~1300 rpm. And everything else works fine. We'll see. If that doesn't help then I'm out of ideas. The MB should be fine since it's starts up, it must have a connection and temperature sensor is working nice I saw it in Speedfan.

I currently set my CPU fan to 3 pin at BIOS. Seems to be working. I'll leave it for now, so I don't harm the CPU. But tomorrow I'll swap out the PSU (though now I'm starting to think that's not the issue).

@AddRAM - Thanks for your suggestions.

Sadly I could't get the other PSU today. But the fan is still working with the "3 pin" BIOS setting. So I'll leave it with that at the moment and mark it as solved. If I figure it out, I'll update.

Thanks for all the answers and all the help!

AddRAM said:

Someone else had a problem with speedfan.

I think it`s garbage, and you don`t need it.

The bios and MB take care of your cpu fan speed just fine.

Speedfan works great here and handles all my cooling fans within one process. I can set each fan to control rpm with as many temp thresholds as I choose. I run a small form factor case with primary cooling from a hybrid CPU fan/duct and no room to jam more fans in there other than opening the case and pointing a stand alone fan at it. My cpu fan runs @ 666 rpm, no change and bios is useless in that department. People squawked at the fan running full rpm and lenovo delivered by making it quiet. Speedfan may not work with every system out there but there are systems that benefit from speedfan. I can assert speedfan has saved my system from a meltdown.

Speedfan does requires some thought to set it up. At first run I had 2nd thoughts and tried to find something better - no joy. I gave it a second try and am now satisfied with it's function. Speedfan gives more granularity control. I can set it up to control all fans to work in concert with 9 temp inputs. It is pretty deep and the interface can be confusing the way all the variables interact. Once you understand the quirky interface it works great.

Replacing the fan was the first thing I did.