My bet is the cat doesn't matter but there is a wiring error. YES YOU PROVED IT WORKED WITH YOUR PC but what if the laptop doesn't feature Auto MDI-X? Then wiring matters.
More at https://en.wikipedia.org/wiki/Medium-dependent_interface#Auto_MDI-X
This is technical so I'll have to go with the usual cause.
I am lost here so please could someone help?
I have a BT Infinity router at home from which I have various sockets run - two were run with CAT5 cables and two using CAT6 cables.
If I plug any laptop into the sockets with CAT5 cables they connect perfectly but when I try use the sockets with CAT6 cables it simply states 'no cable connected' (I have established that both the CAT6 sockets work by moving my computer and trying with the same cables that I tried with the laptops!)
Eventually I tried my Ethernet extender/splitter (apologies for lack of technical terms - I can plug four more cables in from the one socket) when this is plugged into the CAT6 socket then the laptop does recognise that a cable is plugged in but 'no internet connection' - again I have tried the computer in the sockets and it works perfectly.
Can anyone help please as the wifi reception in the room in question is intermittent even with a wifi extender (live in a old building with thick walls!) and I am fed up of my kids constantly nagging me!