With the limited information provided, a simple first step is to make sure the internal battery is either fully charged or is in a condition to accept a charge. When the internal battery's charge is allowed to below a certain level, it will no longer be capable of accepting a charge via the car charger.
The battery can be conditioned to accept a charge easily, however. This is done by connecting the GPS to the computer via USB port, NOT the car charger. Some Garmin GPS units come with a 120 volt charger that connects to the USB port of the GPS - this method is also an acceptable charge / condition method. Leave the GPS connected for 8 hours or longer (over night) and try to power up again.
I hope this helps!
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