do you think the noise may come from psu coil or chassis/cpu fan?  seems those are the two possible noise making components in your pc?  because this is a new model, I suspect psu first. you can open the case and try to locate the source of noise.
This 14 day old machine has a NVMe SSD, yet there is a constant 'chattering' similar to electrical arcing sound continuously, but louder when moving mouse or typing, and a occasional 'squeak' similar to an HDD spinning up.  The machine is sited on the desk (the whole reason for buying a SFF) so this is not ideal. Thoughts anyone?
Optiplex 7090 SFF Chattering noise (SSD)