Ok, so I may just be stupid, but I took the USB cord out of the charger so I could use it on the computer. When I plug it in to my phone and teh computer, nothing happens. Is it supposed to come up on the computer once you plug it in?...It doesn't even charge when I have it plugged into the computer (not sure if that's what it is SUPPOSED to do). Can someone help by informing me what I'm doing wrong or am I thinking it does something that it really doesn't.