LOL sorry guys I was lazy I didn't cable tie the cat5e down and no cap as well. I noticed it worked when I didn't screw on the face plate onto the backbox. What can I say am an amateur. THANKS to everyone.

Thanks fixed it now. I've learnt something anyway. I also learnt pc's tend to have better error handling hence masking the underlying problem. I first noticed the problem when I couldn't get our Chinese streaming device to work but my asus pc would work fine but at reduced speed.

I have actually got on of those testers.

It is pretty basic and just tests continuity/open/short from end to end. For £1.99 delivered it is cheap enough to have sitting in a corner.

When mine was sent it came Royal Mail 24 - a notional next day service, shipped from England. 69p postage ... leaving £1.30 for the tester. So, I wonder how much it actually costs to make? Especially when all the other costs, shipping to UK, UK overheads, packing, profit &c are considered.

I also have one - pretty crude, but allows me to quickly identify which leads are wired x-over.
O, too, marvelled at the low cost