If using the supplied / original BLACK and WHITE USB cord, the black must be used for charging. The white is for data transfer only and lacks connections for power / charging.
Most USB chargers will output 1 amp or less. Many USB jacks on computers output between .5 and 1 amp - max. Your device calls for a charger with 2 amps output. Connecting to devices such as those mentioned above can overload and damage the charger or computer - don't use them!
USB ports have standard connections or "pinouts". You should obtain a USB charger (5V DC) rated for 2 amps (or more for better performance). Be sure to select one with matching USB connector (compatible with your device) - mini, micro, etc.
Amazon has several from which to choose:
Amazon com nabi2 nv7a charger
Idk why it won't charge or do anything. I guess that must of giggled the port loose. Idk
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