OBDII will not respond

I'm trying to get my car inspected and when they pluged in the OBDII connection, the car would not respond. The car is CLK 350 2006 with 5k miles. They also tried with OBDII code scanner and no connection was
made. Anyone know how to get it to connect?
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Go back to dealer and have them find out what is going on. The car is under warranty.
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