It only happens in low load (using a cpu stress test tool completely stops it.) The noise is always the same frequency, it only varies in duration (sometimes is short, other times its a lone droning tone.)
The PSU is proprietary, so I can't swap it out for another one. I put my ear against the PSU, and it doesn't seem to be that.
This PC is (mostly) a headless system, so the only thing that could be on the GPU is a command line, no graphical user interface.
This hard drive was in a different PC, so it can't be that
Here's a link to an clip showcasing the issue (its an audio file with a static image)
https://rainynight.city/linkz/terrible-sound.mp4
The PSU is proprietary, so I can't swap it out for another one. I put my ear against the PSU, and it doesn't seem to be that.
This PC is (mostly) a headless system, so the only thing that could be on the GPU is a command line, no graphical user interface.
This hard drive was in a different PC, so it can't be that
Here's a link to an clip showcasing the issue (its an audio file with a static image)
https://rainynight.city/linkz/terrible-sound.mp4