I received my Aspire Nautilus Starter Kit last week. It is genuine, I checked the code. The US Standard Adapter is making a humming/buzzing noise when it's plugged in for charging. The green light on the usb charger is very dim, even when using my computer to charge the battery. I will often get a green light when I plug in the battery, even though I know it's not fully charged. If I plug the battery into my older generic charger, I get a red light and it charges. Could something be faulty with the adapter and usb charger?