Does Not Recognice!!!

I bought 3 new Clips for my kids when i traveled to the United state,i live in nigeria. Two have no problems at all and the last one does not get recognized when hooked up to the computer . I tried just about everything: I switch to MSC mode, Powered off and held the center button while hooking it up… Went to the Device Manager, the other two are located, but when i go put the third one on it shows up as an unknown device,shows datbase refreshing and batterylow. Any other suggestions? Does this Clip have any hope or should I call customer support? Please help. Thanks

did you switch the USB mode

to check this go to settings,system, USB mode (it should be on auto detect)