No Network Nor Internet Connection

I have no network nor internet connection on my computer. I keep getting a message that a network cable is unplugged; however, i checked my cable on both sides and it is properly plugged in.
It is properly plugged in on my computer and on the switch yet i see that a network cable is unplugged. I already tried another cable but still get the same error with that cable. I also tried connecting my cables on different ports on the switch but it does not help.
I have Windows 7 Ultimate installed on my laptop and i have a 8-port switch. What can be the problem with my computer? Is it possible that the network card might be defect?
