I had the same problem. I dont think the 9to25 pin adaptors are wired right. You will have to redo the pc end of your cable. My problem was I had a 25 to 25 pin cable trying to use the adaptor down to 9 pin to a laptop. Interestingly though if I ran through an a/b switch box that had a 9 pin input and 25 pin output and it would work.