After 8 years, my HW 4 unit stopped working, So I was advised to switch to the HW 5 version—which I did. Naturally, my troubles didn't end there, as the HW 5 unit won't perform any operations on the test bench. I’ve tried both a new cable and a modified old one, but it simply doesn't work. It doesn't detect the MDG, nor does it see the TCU, so performing a reset on the bench is out of the question. What should I do next?