OBD Plug not working

Hi guys.....i have an 00 Grand prix that the engine light came on recently. Went to a local car part store to have them pull the code for me and the plug doesnt work. Figured i would go to another place to see if the first store had a problem with their scanner....no luck the plug seems to be bad. Is there a good way to track this problem down? or have any of you guys had this problem?

Check the cigarette lighter fuse first. odb-ii port uses power off that circuit.

And welcome to AF.