Dell Precision M6400 fans revving repeatedly.

[Derpyholic030]

Out of the blue today the fans on my dell started revving nonstop, and I mean multiple revs per second. All of my temps are normal, and there is no excess system resource usage to speak of. I don't think it's fan failure since it sounds like both fans are doing it. Not only is it concerning sounding, it's also horrendously aggravating to listen to.
Any help or ideas would be greatly appreciated.

 

[webworkings]

Sounds like you need the fans replaced. If it is under warranty, contact the manufacturer.

 

[Derpyholic030]

Sounds like you need the fans replaced. If it is under warranty, contact the manufacturer.

I have a spare fan for the GPU I can try and see if that is indeed the case, I just found it rather strange that both fans would suddenly go out at the same time. They're actually revving in sync, so I thought it may be something other than hardware.
Also it's 8 years old, so there's no hope with warranty or dell support, been there tried that.

 

[william p]

Check the connection on the blue PWM wires in the fan connectors. If they get loose the fans go to 100% speed. Check the wires themselves also.

 

[Derpyholic030]

Check the connection on the blue PWM wires in the fan connectors. If they get loose the fans go to 100% speed. Check the wires themselves also.

The problem is the fans aren't going to 100% speed, they're ramping up and down rapidly multiple times per second.

 

[webworkings]

Hence my suggestion of contacting the manufacturer. I have seen such a problem before. Now if it was doing this when you were doing lots of gaming, I would say it is normal. That ramps up heat, but not from the computer starting up.

 

[william p]

Does it start to do it during POST, or after the OS loads?

 

[smorizio]

gpu will do that if the power from the power supply starts going south. your seeing the gpu reboot and the firmware on the card trying to see the fans and set them to a default speed. if it not power issue then the fan controller on the gpu has gone bad and lost the fan teck speed. to see if it hardware issue remove the video drivers...reboot and reinstall with the last drivers for your hardware. if the error still there see what msi afterburner does when you set the fan speed with msi afterburner do the fans still go crazy. also use hardware info set it to logging and sensor to keep reading the 12v rail output make sure it holding.