Fans are small electric motors with blades attached. If your case doesn't allow for some fancy cable-management then the least you could do is try to neatly secure the cables together so they occupy the least amount of space and don't get in the way of any fans. Normally you would want to make some proper cable management which also increases airflow and helps a LOT with cooling (that means using the features of your case to try and weave the cables through to the other side if you have room then back at the point where you need to connect them. Open up your case and inspect if there are any cables hanging loose near fans. This could either be because in fact it was dirty and you got rid of some dust or because some cable is getting in the way and as your fan speed increases the fan actually sucks the cable towards it and is hitting it with the blades (that would explain why jiggling the case would stop it and also why the cleaning stopped it since you were moving the cables around). With that in mind and the things you have said, there could be plenty of stuff causing it.įirst you're saying that when you cleaned your pc the noise stopped. They just start up on full rev and slow down afterwards as your OS boots.

When you start up your computer the fan controllers aren't yet 'controlling' anything.

My case is 2 years old, so I'm guessing one of the fans is dying, but I don't know for sure since I still don't know which fan is making the noise. Nothing seems to be wrong because I'm not getting any fatal errors, but I'm still worried since the noise is back. And instead of jiggling my case around, it just stopped on its own after a minute. The noise is the same, but quieter than the previous times. However, after that, it didn't make the noise again. Considering I cleaned it out a few weeks earlier, there wasn't really anything in there. So, on the 5th day, I took my case and cleaned it out. Regardless of any games I played, it never started up again until I shutdown and started up my computer. It persisted for about 4 days, and still only happened on startup. Back then, I just jiggled my case a little and it stopped, making me think something got caught in the fan and I got it out. So, about a week ago, every time I started up my computer (Which is only once a day), one of the fans in it would make a very loud noise.

Computer startup sound