CPU fan speed problem / always runs at full speed

[themass]

hi guys,
so i have lenovo g570 running on windows 7 so once it was running and it fall down from me so some cpu fan's wings broke down and made the fan stop , so i had to work on it cuz i had important things so i put another fan which wasn't the same as mine it had less wires than mine ok so when i changed it the fan started to work on full speed , for sure cuz it is not the same , compatible it was just temporary till i buy the original so when i bought the original one and replaced it i was shocked it also runs at full speed too which make loud noise , i need ur help guys 🙁 any idea ??? why is this happening how can i take it back to original speed?

the original fan:

the temporary one :

 

[Nishkarsh13]

install the fan properly and then check that is there any obstacle that is making noise or check that your fan is not damaged.

 

[themass]

install the fan properly and then check that is there any obstacle that is making noise or check that your fan is not damaged.

it is installed properly and the noise comes from fan cause it is ruining at speed ( by noise i mean the fan running at full speed )

 

[DarkTerbear]

I see your original fan has 4 pins, and your temporary has 3. It might be because the speed control on the temporary fan is not compatible with the speed control of your motherboard, so it just runs a full speed to be safe. Try to get a 4 pin fan.

 

[themass]

I see your original fan has 4 pins, and your temporary has 3. It might be because the speed control on the temporary fan is not compatible with the speed control of your motherboard, so it just runs a full speed to be safe. Try to get a 4 pin fan.

Hey thanks for ur reply , yeah that is why i called it temporary i used it for like 3-4 weeks till i got the new one (4 pins original) one but the problem is the original one is also running at the full speed like the temporary one, what i mean is my fan is original fan ( 4 pins) right now and it is running at full speed 🙁