Yesterday we had a pretty bad storm and the lightning got our internet modem. We took it to our ISP and got a new one. When we got home our desktop computer wouldnt connect to the internet because it said a network cable is unplugged. We called our ISP and tried everything they told us to and none of it helped. He said everything on their end looked fine and the problem wasn't anything with the internet. Well we have tried to uninstall the network card then re-install it, still have the problem. So we put a new network card in and still have the same problem. Any suggestions on what else I could try? It all worked fine the day before the storm?

Try replacing the network cable.

We have tried different network cables and it still doesnt detect it. We hooked the cable to my computer and it works so that isnt the problem. Thanks for the suggestion though!

Also forgot to mention that it is running through a router. When the modem is directly plugged into the computer it still does not detect a cable plugged in. I am seriously thinking it is the network card but when a new one is put in we get the same answer. I know for a fact this one works because I took it out of a computer I am not using and it works perfect in that one. This is driving me crazy!

Sounds to me like the RJ-45 port on the modem is the problem. When the modem is directly plugged into the computer it still does not detect a cable plugged in This is VERY indicative of a hardware fault on the modem. I recommend you take it back and exchange it for another.