A bit of a long shot here, but its worth a try. Follow this picture to find a suitable +5v power source(for usb power) and use a multimeter to check if the voltage is existent. If its not then you got a problem. If it is, then use it as a power source for usb power:
Let me know if it works.
that green light is supposed to be flashing, it indicates that the console is attempting to glitch. the fact that you leave it on for 20 minutes though is concerning. i would be that one of the wires came undone.