So, my iMac will not stay asleep when I have my powered USB hub attached to it. Matters not whether it's through inactivity or done manually. It goes to sleep for less than 1 second, then wakes up. It will eventually stay asleep after a number of attempts. It is rather troublesome when you are trying to sleep in the same room. Anyone know any way to solve this (other than the obvious and annoying solution of unplugging the hub)?