Okay so....now....after plugging it back in to its charger -- trying holding down the power button for 30 seconds, trying plugging it in to the computer ... all with no results....I tried plugging it in to my K2 charger (and same cable I connect to computer) and it came on. Now if I plug it back to its own charger the green light comes on and its working normally....wtf!!!
I'll let it slide this once, since it is working and keep an eye on it. If it happens again, time to get it replaced.