I've noticed that the fans on my new PC are making random noises, even when the temperatures are low and the system isn't heavily used. I'm planning to contact the manufacturer for support, but I'm unsure which fan is causing the noise. While it seems like it could be the GPU since it gets louder during GPU-intensive tasks, the noise can still happen when the GPU fans aren't running—especially in games like TF2 and Gmod.
I'd like to identify whether it's the back fan or the CPU fan without risking damage to myself or the computer. Stopping the fan with my finger seems unsafe, and unplugging it while it's powered on could be dangerous. So, is there a safe way to find out which fan it is without using any apps?
3 Answers
First, listen carefully to the noise. Often, fan noise comes from something like a cable being too close to the blades. Also, consider if it might be coil whine from the power supply rather than fan noise.
You could lightly touch the hub of the fan to see if stopping it reduces the noise, but be careful! It shouldn’t hurt you or damage the fan if you do it right.
Do you mean the center part of the fan blade? That feels risky!
Have you thought about using an app? They can give you detailed info about your PC and control the fans. Also, check your BIOS settings. You might find a fan control panel there that can help you.
I get that, but I want to find out which fan is noisy first before dealing with apps. I've also heard people mention noise issues with this PC model, so I'm calling the manufacturer first.

The sound speeds up with the fan noise but there's nothing touching it. Plus, coil whine is more of a squeaky noise, right?