In Tunerpro try testing using Tools - Preferences - Click the Data Acq.Emulation tab at the top of the pop up box - then click "Configure Plug In Component" - Then "Test For Valid Interface Using Settings". If the program finds the cable, then the cable is working. If the program doesn't find the cable, the cable isn't working, or the settins are wrong. Not also - The cable output has to be wired correctly for this test to pass.