Mac Pro slight buzzing noise around power socket

[chipandegg]

The power socket at the back of the mac pro makes a kind of buzzing noise. Only for a short amount of time though. I have have never heard this before as it isnt that loud at all, and only cam across it by chance. I kind of figured out that it might be the electrical current. Any ideas?

Mac works perfectly though, am i just being paranoid

cheers

[Sveetly]

I've started noticing this too.

Mine seems to lessen (but not stop) when I move the case locking mechanism to about 1/2 unlocked . . .