Try connecting the charger to a different port to see if it works. [title] Connect the fitbit to a wall-charger instead of your computer.
[header] How to charge a fitbit [title] Try a different usb port. [step] There's a chance that the usb port you are trying is malfunctioning, or isn't producing enough power to charge the tracker. This is most common with usb hubs, or older usb ports.