The first thing you need to do is to check your cable or connector, also your nabi's charger port; make sure it's cleaned. You may also try to use another charger, cable/connector or adapter; maybe it's already damaged or not fully compatible with your tablet. Another suggestion try to check or use another power outlet. If still none of these basic solutions helps your tablet to charge, you may directly contact an authorized Nabi support center or repair shop. Good luck!