Hello, my computer has recently started to make a humming noise and I'm not sure what exactly is causing it but I'm putting my money on HDD because I've had it for many years and haven't replaced it with a new one. I've checked all the fans for dust/dirt etc and they all seem to be clean, my PSU is rather new got it 1 month ago so I doubt its that, also I've tried removing GPU but got the same noise. Now, the noise usually doesnt start very loud but elevates in pitch and volume the longer the PC is on, and 'spins down' once I power off my machine. How likely is it that the HDD is making this noise? Any way to test it for sure?