Troubleshooting a Mysterious Rumbling Sound from My PC: A Call for Help

For the past two months, I’ve been experiencing a perplexing rumbling noise coming from my PC, and I’m hoping to tap into the community’s knowledge for some guidance. Initially, I suspected that it may be due to a failing fan or perhaps a component jostling against another part inside the casing. After hours of searching online for videos showcasing similar PC sounds, I have yet to find anything that matches what I’m hearing.

I captured a couple of videos that clearly illustrate the sound I’m dealing with. Check out the videos here. The second one might provide a clearer example of the issue.

What I Know So Far

I’m concerned about this situation because the only moving parts in my setup should be the fans and the hard disk drive (HDD). However, after monitoring the fans during the episodes of this noise, they don’t appear to be the source. My operating system is installed on a solid-state drive (SSD), which eliminates traditional HDD sounds like the clicking that often signals failure.

Interestingly, this rumbling noise seems to have a sporadic nature—it can vanish for days on end, only to resurface with renewed intensity. The duration of each episode matches what you’ll see in my videos, and the sound occurs in bursts, repeating a single second of rumbling multiple times over a span of a few minutes. It neither resembles the typical clicking of a failing HDD nor does it seem to originate from the fans. I find myself at a bit of a loss.

My Setup

For context, here are the specifications of my computer:
– Motherboard: MSI
– CPU: Intel i5-6600K
– GPU: GTX 960
– Age of PC: Approximately 5 years

If anyone has insight or suggestions on what this might be or how I could diagnose the issue further, I would greatly appreciate your input. Thank you in advance for any assistance you can provide!