My CPU fan (Scythe Ninja 3) doesn't spin after working for a year

[zyxel]

Hi all

I am having problems with the fan of my Ninja 3 cpu cooler.

4 days ago, when I turned on the computer I found out that the CPU fan wasnt spinning (because of the "CPU Fan error" warning), and I tried to plug another fan in the CPU_FAN motherboard connector (the fan of the stock cpu cooler) and, when I started the computer it spinned, so I thought that the Ninja 3 fan was wrong and I decided to take it to the store where I bought it in order to get it replaced.
But next day, I turned on the computer and the fan was spinning at the correct RPM :S so I didnt take it to the store, and the next 2 days it worked too (yesterday I didnt use the computer), but today I started the computer and I got the "cpu fan error" warning again...

And here is my doubt:
today I have tried to plug the fan in another connector of the motherboard instead of the CPU_Fan one, and it worked :s and it seemed to me (because of the noise) that it was spinning faster than normal, and I found in the motherboard user guide that the connector in which I plugged the fan(CHA_FAN2) is a 12V one (I dont know if this is too much voltage, because it doesnt say the CPU_fan connector's voltage but I thought that the normal voltage for a fan was 5V, that would explain the higher speed I think, sorry for my ignorance)

here is the page of the motherboards manual with the information of the different fan connectors:

Please help, Why does the fan spin when pluged in to the CHA_Fan connector but not in the CPU_Fan one? Can I use the computer with the fan connected to the cha_fan connector? For what I said, do you think that it is the cooler fan what is broken, or it can be the motherboard's cpu_fan connector? and why did the fan just stop spinning after 1 year of working properly? :S

thank you, and sorry for my english (Im spanish)

 

[raybay]

We likely need to know more about your system... It is not unusual for a quality CPU fan to give up after a year of hard use.
Hard to give you an answer without knowing the motherboard, power supply, operating system and such... as well as scans for infestations.

 

[zyxel]

We likely need to know more about your system... It is not unusual for a quality CPU fan to give up after a year of hard use.
Hard to give you an answer without knowing the motherboard, power supply, operating system and such... as well as scans for infestations.

Ok, pc specifications are:

PSU: is a NOX Krypton 100W
motherboard: M4A89GTD pro/usb3 (as shown in the image of the manual)
SO: windows 7 64 bits
CPU: AMD 1090T
PC Case: Coolermaster HAF 912plus

Sorry but I dont understand "scans for infestations", what are "infestations?

Thank you

 

[Cinders]

I wouldn't worry to much about the fan I'd simply replace it with a new one. If that fan gave you the same error you may not be getting power from the fan connector.

 

[fimbles]

Do you have cool and quiet or something similar enabled in your bios?

Do you have any fan control utilities such as speed fan starting with windows?

Other than that, +1 to what cinders posted.