I have a2001 c320 and have problem with key, key turns and light and radio comes on but nothing happens when in start position, also car will not come out of park .

Have you run the car when it was operating properly or did you get it broken?

This might have an electric shift transmission so I'd check for power on that circuit. ( no linkage between the shifter and trans ) If the key turns it is recognizing the smart key.