Unable to connect my lumia 720 to laptop

[WPCentral Question]

Please guide me,how can i connect my laptop from lumia 720,,,,when i connect lumia 720 to laptop through data cable,,charging is started in my phone but not open device in laptop

 

[N_LaRUE]

Please provide this info:

What OS are you using?
Have you connected before?
Are you connected to the internet?