Let me preface this by saying that my IPhone and IPod Touch are syncing with my Mac perfectly. But yesterday when I connected my IPad, it wasn't appearing under Devices in ITunes. I thought that was odd so unplugged it and reinserted the cable several times but still nothing. Then I turned it off and on and still no luck. To cut a long story short, I tried a bunch of things but it still didn't show under Devices. I then plugged it in via a plug in the wall and it displayed a message in the top right corner saying "Not Charging". Turns out that after leaving it for a long time it did actually charge but still displays that message. After charging it back to 100%, I tried connecting to my IMac again and it still isn't appearing in ITunes. Any advice ?