Laptop doesnt recognise specific ethernet cable

Hello,
I bought a FLAT GREY Ethernet Network LAN Patch Cable LSOH LSZH Low Smoke 15m (RJFLAT-15)

I ran it where i need to from my router to a 10/100 switch box.

Before connecting it to the switch box i plugged it into my laptop (dell inspiron 1545) and the laptop wouldn't recognise it. i tried a different ethernet cable from the router which the laptop found and connected to the internet as expected.

I plugged the new cable into the switch and found that the xbox and bluray player both have a connection to the internet and i can play HD content off the BBC Iplayer pefectly.

Is there any particular reason why the laptop wouldnt recognise it, i have tried connecting the laptop to a different cable from the switch box and it still won't connect to the net, so there is something about the new cable it doesn't like.

any help with this to understand why its not playing would be appreciated. It's not a big problem as I am not going to be connecting the laptop to it in the future, but to understand why would help!

Thanks!!

You said you connected it to the laptop before you connected it to the switch, was there anything on the other end of the cable? If you just plug in a dead cable into the laptop it won't see anything.

So it's not just that one cable that does not work. Do you have link lights on the laptop? Does it pick up an IP?

You're adding in some stuff in here that probably reads not the way you intended.

New cable in switch to laptop, no internet. Is there a link light? Do you get an IP?

New cable in exact same port on the switch to xbox and/or bluray, no issue right? Meaning you just unplug the new cable from the laptop, move it to the xbox and that xbox works online.

Old cable to laptop is good it seems, did you try it in the same port as the new cable? Try the new cable with a different computer maybe?

Could be something funky with the connections on the laptop to the new cable though. Since you just got the cable, return it for another of the same thing see if that works.

You tried the same port you used with the new cable with an old one, and it works?

You didn't accidently get a crossover cable did you? Some devices automatically correct for that, some don't.