Can't identify strange noise (video included)

[terry107]

Last week the system started making a strange noise; however, it's not constant. I can shut down the computer and reboot, and the noise will not be there on startup. After a while, the noise will start up again. The tone of the noise isn't constant either. At times, it will pulse in intensity - almost as if a fan is winding down or speeding up. It sounds like it's coming from the video card area, however, if I adjust the speed on the fan via RivaTuner, the noise remains constant. I've attached a short video here. The sound didn't capture very well, so you might have to turn up your volume.

 

[sivart]

If the faster the fan spins the noise remains, it is probably one of two things:

1) Vibration from somewhere within the case caused by the fan
2) Bearings on the fan going out and it needs to be replaced.

 

[mpilchfamily]

Take a good can of air to the coolers. Sounds like you have a chunk of dust or hair caught between the fan and heat sink of either the CPU or GPU.