DJM-750 making buzzing noise when powered on

I just got a brand new DJM-750 today and was disappointed to discover right after powering it on that it emits a faint power buzzing noise when powered on. It's not a loud noise, but it's noticeable in a silent studio. You can definitely hear it if you put your ear next to the mixer. Has anyone noticed this? I doubt the unit I have is defective as it appears to function normally. Was just wondering if anyone else has noticed this...