So, I just got me a iPad, used from here. I've since synced up a bunch of apps, and all that fun stuff. However, while the iPad is connected directly to my Macbook Pro, it doesn't appear to be charging. Currently it shows 'Not charging'. However, when I plug it directly into the wall, it charges just fine. My MBP is a 2009 17", no other USB devices are currently plugged into it. Not sure what to think about this.