I have experienced the noise with a 230V computer power supply unit
Personally, I expect, that the original poster will be able to distinguish between fan noise and a buzzing sound emitted from the SMPS transformer core and is referring to the latter...in general SMPS creates sound due to its exhaust cooling fan.....
There exists other rare source of noise :
In SMPS witch works at switching frequency bellow ~4KHz ( not so usual ) it is possible to use laminated cores.
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