Just got my Vita 100 (though on the back of the sub it says 120) and have noticed the following: 1. there is a hum which i think is because i am only using the cheap lead that came with it - i have another on on order. 2. The auto standby doesnt seem to work. There is no obvious way of telling if it is on or sleeping. Can someone confirm that the LED changes from green when in sleep mode? Its supposed to kick in after 10 mins but i left it for over an hour last night and that light stayed green. Can someone help me out?! Thanks.