MyEarsAreBleedingHelp

I built my PC a few weeks back and it had this high-pitched noise ever since. Here are a few things that I know: 1. It stays stagnant, even in high load. 2. It starts once I power on my PC and ends once the motherboard LEDs turn off. 3. I isolated the PSU, GPU, all of the fans, my wifi card, and my storage devices, they don't seem to be the problem, 4. I cannot exactly pinpoint where the sound is coming from but it seems like it's coming from the back panel side of the case. Sound Test:

I built my PC a few weeks back and it had this high-pitched noise ever since. Here are a few things that I know: 1. It stays stagnant, even in high load. 2. It starts once I power on my PC and ends once the motherboard LEDs turn off. 3. I isolated the PSU, GPU, all of the fans, my wifi card, and my storage devices, they don't seem to be the problem, 4. I cannot exactly pinpoint where the sound is coming from but it seems like it's coming from the back panel side of the case. Sound Test:

I've used the paper-clip method and the PSU is silent besides the fan. Can it be another component causing the coil whine?

How can I test the PSU without plugging things into it?

I just built my PC and now there seems to be a whine coiling problem. The sound stays stagnant throughout my use and it starts once I power my PC on. It doesn't seem to come from my GPU, storage devices, or any of the fans. The only part I suspect is the PSU (Seasonic Focus G 550w 80+ gold). Should I replace it? Is there another part I should look out for? Is it just a vibrating screw?