I set up a PC for my father a few months ago. Recently, he told me that there is too much noise... so I replaced the PSU fan with a Noctua and we got a quiet PC. Now that the noise has been greatly reduced, we can hear strange sounds EVERYTIME the mouse is moved or clicked (the noise from clicking is different from moving the mouse). I'm pretty sure the noise is not from the mouse, because I use the same mouse. Could it be from the mobo, RAM or HDD ?