ah, well it's not PC hum then, but there's definitely some kind of frequency in the background. A very slight mid-high pitched whine somewhere in the background. Unless my ears have finally gone on the blink, which i certainly wouldn't rule out...

Slightly wobbly pitching aside, you've got a nice voice - and one of the things about getting to grips with EQ and compression is they do properly coax out the richnesses of a vocal tone.