I have the new mini (2.3ghz) and had a problem from the very beginning with it shutting down every time I went to wake it from sleep. I took it to the Genius Bar and my Genius couldn't re-create the problem and suggested I must be losing power at home - but I knew this wasn't the problem because all other peripherals plugged into the same power bar were working fine and have never lost power. I went home defeated and tried again. It shut down on my very first try. So I tried to re-create the Genius' environment and first thing I did was unplug my USB hub. And it worked. My USB hub is self-powered (i.e. has its own power adapter). So my question is, does anyone know why my USB hub would make my Mini shutdown when waking?