I have no idea what is going on. For the past couple months on startup, my gpu will make a revving, grinding noise, like it's a failing fan, it would make the sound for about 45 seconds then fade away. Now it's happening constantly, particularly at the desktop or low activity. The problem is, the three fans are off. The sound and where it was coming from was deceiving at first. I had to check each fan in the case, and check the psu. It's the gpu. I unfortunately bought tis pc prebuilt more than a year ago, so the warranty is not valid. I wish I could upload a video of the sound it's making. I have tried turning the fans on but this does not help or change the sound. Any ideas? Thank you very much.