Help ! Diagnostic Port

[Y2KblueZ-28]

I plugged a trouble code scanner and nothing will register and the scanner wont even come on at all. its like my port is dead, i checked connections and wires and i dont know what else to do. i plugged it up turned the key on and nothing happened. i just cleared a code on a 2001 yukon just before that so i know it has to be wiring or the diagnostic port. please help me trouble shoot this mess.

[Frost]

5 threads down from here http://www.ls1.com/forums/showthread.php?t=61386

[richard head]

Mine was out for a period of time. Bad fuse.