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Well this all sounds like a day well spent. Definitely better than popping back to the clowns who installed it and asking them to sort it out.

Your tests seem to indicate that the issue is with the hardware or more likely the set-up, of the new adaptor. I'd stop fiddling, as you'll only make it harder to fix. Just take the laptop back into the local shop who installed it and ask them to take a quick look.