I'm guessing it's a faulty LED. I let it sit all night synced to the tablet (to try and wear down the battery) and just plugged it in with no LED notification that it is charging. This is the same cable I use to charge my N10 and N7 so I know enough juice is flowing to the keyboard. Is the button I see simply to initiate a sync to the tablet? I don't see the button or LED mentioned in the "instructions".