[nynor]

dave, cry me a river. i wired scores of dental offices for mainframes (no kidding). get a digital monitor, run the wire and be done with it. you've already determined that it won't work.

then again, you can't see what the wire is doing and where it goes. perhaps the wiring is fubar or their is another mistake.

get a replacement cable and hook it up directly to the monitor to test.