Had my HD box for 2 days now but the pleasure is somewhat muted by what I think is the hard drive chattering. I have an expensive AV system but during quite moments in the sound track I am disturbed by this constant noise even though I am sitting 12 ft away. Is the hard drive active 24/7? Even when the unit is in standby the random ticking continues. Apart from fan noise is the unit completely silent in other homes?