The "confirmation" on the command window just tells you that the software did what it was supposed to do and did not detect any error in doing it. It does not necessarily mean that you should be able to see some changes on your "neural recording monitor", since it is not a test for your hardware.
It seems that you did some tests on your hardware, but you need to describe the details about what you tested and how you did. From what you wrote, it is difficult to tell which test was relevant and what was ruled out. If your lab members are using the same equipment, are they experiencing the same problem?
The first thing I would test is whether a voltage change is detected at the OmniPlex side of the behavioral code cable. Since the strobe test sends out too many codes too fast, you probably need to write a timing script that sends some known codes at a slower rate, for example, like alternating 0 and 1 every second.
for m=1:20
eventmarker(1);
idle(1000);
eventmarker(0);
idle(1000);
end
Then you can check the cable line connected to Port 0 Line 8 (p0.8).
If you think this is a software problem, you can test it with a tool provided by NI. Run NI MAX and open a test panel of your device. You can turn on and off each digital line there.

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