[michiganjfrog]

I say its the battery. Because I recall that the green light doesn't come on unless you connect the usb cable. Presumably, that means the battery has to be alive & kicking for the green light to come on. Has anyone figured out how these lights work, anyway?

It seems the green light shuts off after recharging is at full cap, but I haven't confirmed this every time. Que gave a good suggestion about using the USB port, which will solve the mystery of whether the AC charger is still good.