I have three runs of Cat 6 cable I have dragged under a floor and downstairs.
I have bought a cheap tester.
One cable, fine. The tester shows all eight lights and my laptop connects using it.
The second cable, the tester all eight lights in order, but laptop doesn't connect-I'll try re-crimping the ends on that.
The third cable is the one that bothers me-the tester doesn't light any lights. This I have hand-crimped a plug into the network switch on one end and I have put a punch-down keystone jack in a wall at the other end. I put a working patch cable into the jack and try the tester but no lights at all. I can imagine that maybe going under the floor and through joists I have managed to break a few of the wires, but hard to believe I have broken at least six of them? If even a few were still OK the tester should have at least one light? I don't think I am going crackers and testing the ends of two different cables. I can try re-crimping another plug, but I don't see how that likely really to help.
Am I missing anything? Any other reasons that would mean the tester wouldn't light any lights?