If resetting it didnt work, try a new charger.. (usb charger right?)
If that didn't work....
Toss it.. buy a new one. They call them all in one for a reason.
Sorry guy, but you aren't the first person i've seen having problems with those aio devices. End result is the same.. check usb charger, try reset. try new coil.. toss mod and buy another one. You can get an nice starter kit for about the same cost, with replaceable coils and batteries.