Freddie,
Thanks for your suggestions.
I tried 1 & 2 to no avail.
For 3, my graphics ‘‘card’’ is part of the motherboard.
I tried plugging in the CMCs into another computer and the same issue occurs.
It is like I am plugging a USB cable with nothing on the other end.
It’s like the CMCs are fried/dead…
Is it possible a voltage spike from the USB hub fried the internal electronics on all 8 units?