I've tried all that with no luck, i was about to return it and thought... well give it a good kick to get things moving.... ( didn't actually kick it) but tapped it on top bottom and near the red light, and to my surprise... the green light finally came on after 3 hours of messing with it.... luck was with me tonight.
If it and all else fails again, pop it open and inspect for poor connections/soldering. Bad, tiny PCB soldering faults can be hard to detect or fix, but maybe you'll get lucky and find something you can learn from.
OE