Well, if it helps, the cables that DON'T connect pin 20 came from here while the cable that DOES connect pin 20 came from here.

They're just generic ones, of course, but quite high quality ones. Aside from the wiring being wrong on the second one...

You'd think that any high end expensive one would be right, but life doesn't necessarily work that way.

pca
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Experience is what you get just after it would have helped...