I realise all of that, but the fact is that I unplugged the cables at the box and swapped ports and that just moved the problem, so it's not the cable. It must therefore be the yellow port, but why?
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I disconnected all PCs and then swapped cables on the laptop and the desktop. Suddenly the laptop worked fine and the desktop slowed to a near halt. This is pretty good evidence that it is the yellow ...
Thanks for the advice. I used the install disk once, that was enough. I recently reinstalled Windows after a hard disk crash and it still works perfectly-ish, though, to be honest I think my crappy li ...
Coincidentally, I too live in France, don't speak great French and have a sh***y Orange Livebox which I couldn't connect using the second red ethernet port. Now I can.