50 Hz hum recording from USB headset (UK)

I have a new 2011 MacMini, with nothing plugged into the microphone input. I am using a Logitech USB Headset for both input and output, which seems to work fine.
However, when I try to record through a number of applications, including QuickTime Player 7, I get a nice clean low-level 50Hz (UK power) hum.
Why, if recording through a USB Headset, should I ever encounter 50Hz (60Hz) power hum?
How do I get rid of it?
Note: I see the MacMini does *not* have a grounded power input, only a 2-prong power connector...
*urgent*
Thanks!
btw- I have read that DVI connectors or similar can inject hum... But (a) this is a USB audio input and (b) I have tried unplugging my second and first monitors alternately, and hooking them to HDMI and Thunderbolt outputs --- No Change in hum.

HOLY COW!
Don't buy Logitech!
I plugged a cheap webcam into the same USB port; works prefectly, no hum at all.
The Logitech microphone element or USB parts must be picking up 50Hz hum through the air (radio waves). Yuck!
If I press the "mute mic" button on the headset cable, the hum goes away... Of course, so does the audio...

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50 Hz hum recording from USB headset (UK)

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