Hi there and welcome to Just Answer. I'm Steve. Thanks for asking your question. I'm sorry to hear about your GPS.
Is this when it is running on battery, on your card cord, or both?
Can you confirm that the car cord is working, there is a green LED on it (red on some versions) that should light up when you plug it into the car.
Let me know.
Ok, so is your issue fixed?
Ok, good luck and if you need any more help, you can request me here: http://www.justanswer.com/electronics/expert-steveguru/