Case fan stops and starts

oldestgregg

oldestgregg

oldestgregg

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Joined
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Durham
Hey,
So I built a new PC about 6 month ago and have not had a single problem with it. Howevert I turned it on this morning and the corsair 120 performance 4 pin fan at the rear of the case which is plugged into the motherboard direct seems to lose power every 2 seconds then spin for 2 seconds then lose power. All parts were bought new when I built it so any ideas? The PSU is a corsair ax1200i and the rest of the fans on the case are ok and the cpu fans for the h100i are ok also. Only the single rear fan has this problem and its plugged into the mobo directly. I powered down and unplugged the fan then plugged back in and it seems ok but I cant help but worry its an underlying fault
 
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If you have enough cable on your fan try plugging it into another header and see if the problem persists.
 
Giggz said:
If you have enough cable on your fan try plugging it into another header and see if the problem persists.
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Its not a very long wire Giggz so it will only go into one header. The top fans are the h100i so they direct and the front 200mm is into the corsair 650d fan controller
 
I managed to change headers but as I said it was the first time that had happened so I dont know if its a one off thing or not. I thought maybe someone on here might be able to shed some light on it
 
If I plug it into the 4 pin next to the cpu header it ends up flat out when the cpu is under load and if I try it in the 3 pin it spins 100% all the time so Im baffled as to why it wouldnt power up properly from the original 4 pin it was in. Its back in the original header now but I cant help but worry its going to happen again
 
the fan is 4 pin right and the header is 4 pin? What motherboard do you have and we can look further into this.. Some asus motherboards for example have Q-FAN and you have to either enable it or set it up properly to make PWM fans work :)
 
I have the gigabyte z87x ud3h. I managed to connect the fan to a 4 pin at the bottom of the board but it does the same as well. It powers on with the pc then spins down and moves half an inch as if it will start up again but dosnt move. If I give it a push it starts up though. I have corsair link set up if that can tell me anything? The fan has worked since I bought it maybe 5 month ago though so I cant see a bios setting changing anything as I didnt change anything myself
 
I don't actually know the starting power draw of these but maybe it exceeds the headers output.. You say it moves an inch and if you push it then it will start.. I think that the power draw to start these might be more than your motherboard headers are outputting.

Might seem insane but have you tried using your mouse in a different usb port?

This is an odd one indeed as your fan seems perfectly fine but its your board doing it from what can gather but it used to work?
 
GrimsbyLAD said:
I don't actually know the starting power draw of these but maybe it exceeds the headers output.. You say it moves an inch and if you push it then it will start.. I think that the power draw to start these might be more than your motherboard headers are outputting.

Might seem insane but have you tried using your mouse in a different usb port?

This is an odd one indeed as your fan seems perfectly fine but its your board doing it from what can gather but it used to work?
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Yes it did matey and yes I have. I have installed EZtune to have a look and it goes through calibration fine. Does this make sense when I say that I think it may be temp related? It was freezing in my house this morning for the first time since I bought the set up and it did it from a cold start. After had been playing around with it and powered down it didnt do it. I switched fan headers and left the PC off for a couple of hours with the windows wide open while I cleaned the house and when I stated it up again the same problem happened. Could it be that it does not power on the sys fan unless the system is over a certain low temp?
 
Is the header set to voltage control rather than pwm in the bios (if the board allows such configuration)?
 
If it is able to be set to voltage regulation it could be that as you mentioned above with the cold start and low temps its just not applying enough voltage to get it moving but once warmed up does.
If it's set to pwm try with a more aggressive profile and see if that helps.
 
eddyr said:
If it is able to be set to voltage regulation it could be that as you mentioned above with the cold start and low temps its just not applying enough voltage to get it moving but once warmed up does.
If it's set to pwm try with a more aggressive profile and see if that helps.
Click to expand...

Thanks dude. Does your Gigabyte mobo have pwm voltage regulation?
 
Just checked, on my board under pc health I have the fan options. I can set CPU fan header to pwm or voltage only. The rest appear pwm only with 'slope' otions to set how quickly it ramps up the fan speed.
 
Yeah I been looking into it and as far as I can see the only way to sort it should it happen again tomorrow morning is to get a 3 pin and link it back up with the fan controls on my 650d.
 
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